Your X200 video card is towards the lower end of display. It may have been great for XP but Win7 expects more. Further, it has to support the "Aero format" which is more demanding video amongest all the Win7 video setting. It may also be a video resolution that's not supported or the video card itself has gotten too old and showing it's age, time to replace. I suggest for the NVida 5450, low power demands and supports Win7 easily and has the wide range of video settings, plus it moves away from whatever is causing your current issue, quite possibility.
If Win7 isn't mentioned, then get the replacement video card, playing with setting etc., won't improve your PC or last. It's time to get a new video card.
Just had windows 7 installed at a reputable local center, now I get frequent blackouts followed by return to the same page with the message "Display driver stopped responding and has recovered, ATI Radeon family...."when I checked the driver it's Radeon Xpress 200, when I checked the manufacturers website that is listed as being suitable for XP but windows 7 isn't mentioned. As someone who isn't skilled at this stuff, please help, what should I do?