Hello to you as well. Thank you for posting this, I will try to help you.
If you do not have the latest patch of your video card installed, Try Installing the latest patch.
If you have reinstalled everything, the Display Settings of your computer might have went back to the default settings, or changed. You can change these settings to what they were used to, and change it the way you like.
If you have reinstalled the games, their video settings might not fit yours and may be changed. So go to your game settings and set it the way it should be.
You can also go to websites and forums about yor games, and ask them if they have a patch for your video card, or if the game has any problems and such, and you may find something.
You can also ask the technicians and forums about your video card and such.
Your hard drive might not have enough free space to play that game, You might also want to try leaving some space in your hard drive, so it will work easier.
You can run anti virus and such programs and install video and display utilities to make the games work.
And there are many possibblities, I hope you will be able to work your games.
I hope I have helped you
Bye, And have a nice day.