It might be worth posting some screenshots from the dxdiag screen (Press Windows Key + R to bring up the run window, then put in "dxdiag"). You'll want the "System" and one of the "Display" tabs. This will punch out the information that we need to see what GPU you're using. It's also possible to save all this information to a text file, which you can use for sharing around (in fact IIRC, if you're posting for technical support on this forum, you HAVE to provide that dxdiag window, so it's a useful feature to note)