windows xp and windows vista?

There COULD problems with SOME games that were only built for XP. However you could try to play them by changing their compatibility.

Find your game executable file (.exe) which is usually found in the Programs and Files folder.

For example:

GTA: San Andreas

1. Computer

2. Your local hard drive (USUALLy C:/)

3. Programs Files

4. Rockstar Games

5. GTA San Andreas

6. gta_sa.exe

7. Right click > Properties > Compatibility

8. Check the box that reads: Run this program in compatibility mode for:

9. I always choose the latest Windows XP which is Windows XP (Service Pack 3)

10. Hit OK

Now, if you had problems when playing your game it SHOULD be fixed now.

Remember again, some games were designed only for XP and MIGHT NO work for Vista.