Hi Keyhan. I'm Greg, 10 years awarded Windows MVP, here to help you.
What type of reinstall did you do? The definition of a Clean Install is to delete all partitions off the hard drive (with all other drives unplugged), then click Next to auto-create and format the needed partitions and begin - this makes it foolproof.
If those are your games then something is saving them, and if you did a true Clean Install there would be nothing left to save them if you don't use a MS Account
You can clear and reset the Microsoft Store cache as shown here:
http://www.thewindowsclub.com/reset-windows-sto...
If that's not enough reset the Store here:
https://www.groovypost.com/howto/reset-windows-...
Feel free to ask back any questions. Based on the results you post back I may have other suggestions if necessary.
______________________________________________
Standard Disclaimer: There are links to non-Microsoft websites. The pages appear to be providing accurate, safe information. Watch out for ads on the sites that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the sites before you decide to download and install it.