Delphi 2015 R3 DS150E and XE8 IDE won't start: startup issues, .NET, VC++ runtime, security blocks

User question

delphi 2015 wont start

Artificial Intelligence Response

Direct answer to the question

• “Delphi 2015 won’t start” usually refers to the Delphi/Autocom 2015 R3 vehicle-diagnostics app for DS150E. The most common causes are blocked/quarantined files by Windows Defender/AV, missing legacy runtimes (.NET 3.5, VC++ x86), or a corrupt activation/config database. Less commonly, it refers to the Embarcadero Delphi XE8 IDE (2015), which fails to start due to a bad plugin/profile or licensing.
• Key points
  • First confirm which product you have: Autocom/Delphi 2015 R3 (diagnostics) or Embarcadero Delphi XE8 IDE.
  • On Windows 10/11 (as of Jan 8, 2026), enable .NET 3.5, install VC++ x86 redistributables, and (for Autocom) install SQL Server Compact 3.5 SP2 (x86 and x64).
  • Exclude the program folder from Defender/AV, then do a clean reinstall and reset the ProgramData/AppData folders.
  • If it still won’t start, check Windows Event Viewer and use a clean user profile to rule out configuration corruption.

Detailed problem analysis

A. Identify the product

• Autocom/Delphi 2015 R3 (DS150E diagnostics)
  • Symptoms: nothing happens on launch; splash closes; “Unknown error during init”; activation requested every start; interface not detected.
  • Root causes
  • Security: Defender/AV/SmartScreen quarantines the main EXE or updater, or Controlled Folder Access blocks writes to ProgramData/AppData.
  • Runtimes: missing .NET Framework 3.5 (includes 2.0/3.0), missing VC++ x86 redistributables (2005/2008/2010; often 2012/2013 too), or missing SQL Server Compact 3.5 SP2.
  • Corrupt or mismatched data: mixed files from other releases; corrupt activation/config in ProgramData/AppData; database path missing/read‑only.
  • Permissions/paths: install under Program Files with UAC/ACL restrictions; first run not done “as Administrator”.
  • Device/driver noise: DS150E driver problems can cause early init failures.
• Embarcadero Delphi XE8 IDE (2015)
  • Symptoms: IDE splash then exit; license message; internal error; hangs on loading a package.
  • Root causes: corrupted user profile (BDS 16.0), broken/bad 3rd‑party package/BPL, licensing service trouble, PATH/registry collisions.

B. Targeted repair flow (Autocom/Delphi 2015 R3) 1) Security off while repairing

• Temporarily disable Defender real‑time protection and any 3rd‑party AV.
• Add permanent exclusions for:
  • The installation directory (e.g., C:\Delphi2015 or your chosen path).
  • The setup/media directory you install from.
• In Windows Security > Virus & threat protection > Protection history, restore anything previously quarantined that belongs to the app. Also check App & Browser Control > Reputation-based protection > Blocked items.
• If Controlled Folder Access is on, add the executable as an allowed app or turn CFA off during install/test.

2) Install all prerequisites (x86 even on 64‑bit Windows)

• Turn on .NET 3.5: Control Panel > “Turn Windows features on or off” > .NET Framework 3.5 (or run: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All).
• VC++ redistributables: install x86 for 2005/2008/2010 (and ideally 2012/2013). Installing the unified 2015–2022 runtime doesn’t replace the need for older x86 redists.
• SQL Server Compact 3.5 SP2: install both x86 and x64. Many 2015R3 builds rely on this for their local database.

3) Clean configuration and reinstall

• Uninstall the app.
• Manually remove residual folders (after showing hidden items):
  • C:\ProgramData\Delphi\ and/or \Autocom\
  • C:\Users\\AppData\Roaming\Delphi\ and/or \Autocom\
  • The old installation folder under C:\Program Files (x86)\ or any custom path
• Reboot.
• Reinstall to a simple path (e.g., C:\Delphi2015) to avoid ACL and long‑path issues. Do not start yet.
• First launch: right‑click the main EXE > Run as administrator so it can create its config.
• If you previously saw “Unknown error during init”:
  • Verify the program’s database (CARS/TRUCKS data) is present where the app expects it.
  • Do not mix executables/config from different releases; keep the set consistent.

4) If it still won’t start

• Event Viewer: Windows Logs > Application. Look for .NET, side‑by‑side (SxS), or application errors at launch time. Common clues: missing VC runtime DLL, SQL CE DLL, or access denied to ProgramData/AppData.
• File “Unblock”: Right‑click the EXE > Properties. If you see “This file came from another computer”, click Unblock.
• New Windows user profile: create a local test user; install and run there to rule out profile corruption.
• Interface isolation: try with DS150E unplugged; if it only fails when plugged, suspect the driver stack.

C. Repair flow (Embarcadero Delphi XE8 IDE)

• Reset the IDE profile without reinstall: open an elevated CMD in the XE8 bin folder and run bds.exe -rNewProfile (creates a clean settings hive).
• Temporarily disable 3rd‑party experts/packages: start with bds.exe -np (no packages) to see if the IDE starts.
• Rename or back up the configuration folders:
  • %AppData%\Embarcadero\BDS\16.0
  • %Public%\Documents\Embarcadero\Studio\16.0
• Run the IDE once as Administrator.
• Check the license manager if you get license errors; re‑register if needed.
• Event Viewer for BDS.exe application errors; remove or reinstall the package that crashes the IDE.

Current information and trends

• Windows 10/11 (including 23H2/24H2) increasingly enforces reputation-based blocking and Controlled Folder Access; legacy apps that write to ProgramData/AppData are often impacted.
• Microsoft distributes a unified VC++ 2015–2022 runtime, but many older apps still need the separate 2005/2008/2010 x86 redistributables.
• .NET 3.5 is a Feature on Demand; if your PC is offline, enabling it may fail until you connect or use the offline SxS source.
• Code signing and SmartScreen policies are stricter in 2026; unsigned/modified binaries are more likely to be blocked at launch.

Supporting explanations and details

• Why x86 runtimes on x64 Windows: the application is 32‑bit; it loads x86 CRT and SQL CE DLLs. Missing x86 redistributables cause silent exits.
• SQL Server Compact vs full SQL: many 2015R3 builds use SQL CE 3.5 SP2 for local catalogs; startup fails if its provider DLLs aren’t registered.
• ProgramData/AppData usage: activation/config and DB paths are stored here; corruption or read‑only status prevents initialization.
• Compatibility mode: helps when the app assumes Windows 7 behaviors (file virtualization, DPI). It won’t fix missing dependencies.

Ethical and legal aspects

• Use properly licensed software and data. Modified/“cracked” executables can violate EULAs and often contain malware. For professional diagnostics, prefer legitimate distributions from authorized vendors.
• If you service customer vehicles, ensure your software and interfaces comply with relevant right-to-repair, emissions, and safety regulations in your jurisdiction.

Practical guidelines

• 30‑minute triage checklist (Autocom/Delphi 2015 R3) 1) Disconnect DS150E. Disable Defender real‑time protection and add exclusions.
  2) Enable .NET 3.5; install VC++ x86 2005/2008/2010; install SQL CE 3.5 SP2 (x86+x64).
  3) Clean ProgramData/AppData and reinstall to C:\Delphi2015. First run as Administrator.
  4) If “Unknown error during init”, verify database presence/path and avoid mixed files.
  5) If still failing, check Event Viewer for missing DLL or access denied, Unblock the EXE, and try a new user profile.

• 20‑minute triage checklist (Delphi XE8 IDE) 1) bds.exe -rNewProfile
  2) bds.exe -np
  3) Rename %AppData%\Embarcadero\BDS\16.0 and %Public%\Documents\Embarcadero\Studio\16.0, then relaunch.
  4) Inspect Event Viewer and licensing.

Possible disclaimers or additional notes

• There are many repackaged 2015R3 builds; steps can vary slightly. The above flow addresses the dependencies and Windows hardening that most commonly block startup.
• We cannot provide activation bypass instructions. If activation fails, contact the software vendor or use a legitimate package compatible with your OS.

Suggestions for further research

• Check your exact Windows build (Settings > System > About) and list of installed VC++ redistributables to confirm versions present.
• If Event Viewer shows side‑by‑side (SxS) errors, use sxstrace to pinpoint the missing manifest/runtime.
• Use Process Monitor (ProcMon) with a filter on the EXE to see the last successful file/DLL access before the exit.

Brief summary

• Most “Delphi 2015 won’t start” cases on Windows 10/11 are fixed by: disabling AV during install, enabling .NET 3.5, installing VC++ x86 redists and SQL CE 3.5 SP2, cleaning ProgramData/AppData, and reinstalling to a simple path, then first‑run as Admin. If it’s the Delphi XE8 IDE, reset the profile (bds.exe -rNewProfile) and disable packages.
• Please tell me:
  • Which product (Autocom/Delphi 2015 R3 vs Embarcadero Delphi XE8 IDE)?
  • Your Windows version/build (e.g., Windows 10 Pro 22H2 64‑bit).
  • Exact symptom or error text (e.g., “Unknown error during init,” silent exit, repeated activation).
  • Whether Defender/AV has flagged/quarantined anything. With those details I can tailor the next steps precisely to your setup.

Disclaimer: The responses provided by artificial intelligence (language model) may be inaccurate and misleading. Elektroda is not responsible for the accuracy, reliability, or completeness of the presented information. All responses should be verified by the user.