On my old PC, upon installing Site Advisor, it caused XP Pro w/ IE7 to run incredably slow.
I had been having problems with my old PC anyway, so I uninstalled it and IE7 browsed normal again.
I purchased a new Duo Quad machine, with XP Pro, 1 T byte SATA drive, 16 Gig Ram, Dual Video Cards, IE7, Service Pack 3 and the latest updates from MS all done. This machine "Rocks". On Mar 21 2009, I decided to try Site Advisor on this new machine. Upon installation, the large 'pop-up' stating it is installing never went away. After several minutes, I clicked the Icon to start IE to see if it would open. The Icon appeared to be depressed, as in a button, but did not return to normal... oh... not good. At that point, I waited as the movement of the 'installing' bar continued. After another minute, I took a look at my hard drive working LED and it showed no activity... hmmmm, not good. I now have this not so 'warm and fuzzy' feeling as this machine does most all simple tasks instantly. Okay, I do a Control-Alt-Delete to look at the four processors, and nothing! It is hung. Argggg! I wait for a bit longer, move the mouse around in circles to pass the time, get a cup of coffee... still hung. I had to do a hard boot to get out of this. So, I am back, open my IE browser, come here, 'sign up' and read the posts. Anyone else having these problems?