Not a fix for me :-\
Launch IE8, goto Tools menu and DISABLE SmartScreenFilter
SmartScreenFilter is IE8's unsafe site blocker. It's doing the same thing that SpyBot S&D does.
Hi, all- one issue that I've been having since updating to IE8, (aside from the slow down with the browser when immunized), is that Windows XP start up is also slowed, as is opening Windows Explorer, or even the Control panel. The problem feels similar to a problem that arises if you have a LARGE hosts file AND the DNS Client service enabled. I had to un-immunize IE8, (I use Spybot, and Spyware Blaster), which resolved not only the IE8 browser issues, but the other issues as well. I was able to leave the immunization for FireFox enabled.
:sad: To get to the point of this thread, I also went into IE8 and turned off SmartScreenFilter on all 3 computers here. Turning it off had absolutely no effect for me :sad: The only thing that worked was un-immunizing IE8. Why would Windows Explorer, XP start up etc. slow down as well as the browser?