What is your exact brand/model graphics adapter (ATI or nVidia or ???)
What is your exact graphics adapter driver version?
Have you gone to the vendor web site to check for a newer driver?
For Windows, do NOT rely on Windows Update to have current driver information
-you need to go direct to the vendor web site and check updates for yourself
ATI Driver Autodetect http://support.amd.com/en-us/download/auto-detect-tool
nVidia Driver Downloads http://www.nvidia.com/Download/index.aspx?lang=en-us
Also, exactly what are you editing?
Codec & Format information, read both links in reply #1 http://forums.adobe.com/thread/1270588
Report back with the codec details of your file, use the programs below... A screen shot works well to SHOW people what you are doing
http://forums.adobe.com/thread/592070?tstart=30 for screen shot instructions
What software are you using to play your video? Windows Media Player for XP is pretty limited in the video formats it can play.
What happens if you play the file with the great VLC Player (a free download)?
In your Reply #2, your text did not attach. This often happens when one is accessing the Forums via e-mail. If possible, can you access the Forums via a Web browser, and let us know what you intended to post in Reply #2?