Welcome to the forum.
The first thing that I would do is check on your video card's mfgr's. Web site, to see if you have the latest video driver. If not, download and install that. Do not trust Windows, or any driver utility, to tell you if you have the latest. They will likely be at least 6 mos. out of date.
If that does not work, then I would see this FAQ Entry: http://forums.adobe.com/thread/792580?tstart=0
It starts with a general checklist for getting PrE set up properly, then goes into some links on tuning up one's system and OS, and finally has links to many troubleshooting articles, plus tools to help one troubleshoot issues.