Hi,
In the old days with the yukky yukky graphics cards and Windows not handling them correctly, you might have had an issue.
With W7-64bit, I seriously doubt that a video card would be interfering with ANY music thing ... with one possible exception ... let's say that 15 trax are running and the display on that should not be an issue, but on a laptop? ... not the same thing with a display that is not as responsive as your 24-inch on your studio!
My understanding is that laptops need to be way up there to be efficient with Windows (same as the Mac's ... you have to spend a fortune!) ... but with the 64-bit, which is not considered a Home version of Windows, but a version for professionals and network users, in general, you should not have a problem.
Those ratings, btw, are arbitrary at best, since W7 is inventing numbers that are not real! ... you can get Blind Onion or many other utilities on the net that will read you this information way better than Windows every will! I think that utility was designed to make suggestions so you would spend more money upgrading your computer! ... like more memory usually gets a higher number, for example!
Note: I have the same video card (a GTX) on two machines. One with W7-64bit and the other with XP-Pro. The Windows machine has 8G of memory. The XP machien has 4, and of course Windows doesn't even use anything past 3.5 or so. Guess what? ... the running of World of Warcraft on the XP machine is about 11% more efficient than the bigger and better machine with the 64bit. My thoughts are leaning towards the fact that Windows is known for giving us false information and that the 64bit thing is either too tough on most software and hardware, or really not that good!