According to Adobe website, your card is not listed as supported :
http://kb2.adobe.com/cps/831/cpsid_83117.html
So you probably have OpenGL on your card, but not a sufficently advanced version for CS5. Ask for a refund or an exchange if you can.
For the record, can you run the OpenGL Extension Viewer from here, and post the OpenGL version it displays ?
http://www.realtech-vr.com/glview/download.html



