I would like to thank everyone for their advice because I was able to use GParted

The very operation with this program lasted about 25 minutes. It was not without a moment of terror because after the operation Windows 7 did not want to start, the installation CD and the REPAIR option helped. Now it looks like this:
mati211p I agree with you that these 500MB of added space is a drop, but I meant more a trial, now I will transfer about 5 GB to the disk with Windows 7 because I use 99.9% of it. Windows XP stayed because I have a fondness for it, I used it for so many years

I have installed Windows 7 for about 6 years and during this time it has grown to almost 36GB! Of course, before adding free space, I did all the steps to free up the maximum amount of free space on C (CCleaner, transfer all unnecessary files to another disk) but of course I assume the option of buying a second disk. And immediately a question to this: will I have to install a new system after buying a new disk or will it be possible to transfer the "old" with all settings to this new disk?