Installing this on Vista 64 SP1 had a large negative impact on my 3D graphics performance. For example, after installing this and running 3DMark Vantage, I experienced severe graphics distortion (waves in the first test were huge and blocky) as well as a huge drop in FPS (50-60 normally, 15 after installing this.) Uninstalled it - problems persisted. I next tried using the Windows Vista Restore funtion to restore the system to a point before I installed this - problems persisted. I wound up having to reinstall an image backup I had made a day before to get back to normallcy. So be warned...