Missing Windows 7 Boot Option After Linux Ubuntu Installation on New HDD

Hello

I got a computer from the repair shop with a new, clean HDD. After installing Windows 7, I decided to install Linux Ubuntu (I have a 1TB disk, I created 2 partitions for Windows 250 and 500 and left about 200 GB unallocated). I created a boot-oval pen-drive and in the Ubuntu installation menu I chose "Install alongside Windows", I thought it would install in an unallocated space. After installation, when I restart my computer, I do not have Windows to choose from, only Ubuntu. Linux sees windows partitions and my files are in them (it turns out that linux installed on C? During installation I didn't change any installation location because as I mentioned, I thought it would install in an unallocated space). And now the question: can I add the option to start Windows at startup? Do I need to reinstall it and remove Linux?
Thank you in advance and best regards.

You didn't write what version of W7 (architecture) and Ubuntu too.
A photo from GParted indicated.

There is something like this for not only repairs:
https://launchpad.net/grub-customizer
https://help.ubuntu.com/community/Boot-Repair

Ultimate 64 bit, Ubuntu 16.04.3 LTS 64 bit

Pan Korsarz wrote:

Can I add an option to start Windows at startup?

Maybe a repair is enough - https://answers.microsoft.com/pl-pl/windows/f...7/b1a02e8a-41fe-45dd-96dd-7726ed135ec2?auth=1

Moderated By gulson:

Report: Since Ubuntu starts, it's GRUB but for some reason there is no Windows bootmanager entry in its configuration. The way from the link will likely crash GRUB and you will not be able to access Ubuntu.

This is some very complicated "utility is on the installation CD in the x: \ boot folder; the / force switch forces overwriting mbr" where wgl should I enter these commands?

Added after 4 [minutes]:

Okay, gentlemen, I will reinstall Windows, it will be faster, I thought it could be arranged immediately.
Thanks for the quick replies, this is helpful.

Run the Windows 7 installer, select repair the computer and proceed as in the description above.
You can also help with this - https://www.elektroda.pl/rtvforum/topic3279232.html [so as not to destroy GRUB.]