I'm sort of blogging this to see if anyone else has had similar symptoms.
I've been having trouble getting the security patch KB948109 installed on my laptop - SMS has tried installing the patch about six times now, it seems like my SQL Server instance is patched but my SQL Express instance refuses to take it even if I stop the SQL Express service :-(
One of the things I tried last week manually going to Windows Update to install it. While I was there I noticed Windows Search 4.0 and thought I'd install that too. Big mistake.
Immediately after I installed Search, any use of the Google Toolbar crashed the toolbar and then IE. It took me a day and a half to get back to some kind of working configuration, even using Windows Restore didn't solve the problem. I don't have a proper resolution now, I can't use the Google Toolbar and using the IE Search box with Google has ... interesting effects.