Change resolution Windows 7

Has anyone had an issue with the new edition of Avast not allowing your PC to change resolution? After I updated my registration to Avast last week, anytime I go to a website or use a game that changes the resolution, my computer locks up with the screen changing colors from black to white to gray to colored stripes. The only way that I can get out of this screen is to shut the computer off. Any suggestions from anyone?

What type of graphics card do you have, what resolution does the game change your monitor to, and do you have the latest drivers for your video card?

If you change the res to anything other than the recomended setting the screen goes flaky. Yes, I have the latest drivers for the video card and have unistalled and reinstalled them. I have had the games installed for over a year and have only started having this problem since reregistering my Avast.