I am having the same problems with SiteAdvisor as with TrendProtect.  They both freeze up IE7 and the only way to get out of it is to manually power off the machine.  The only thing that usually registers in my event logs is a disruptive shutdown, and a few times SA and TP were listed as causing IE7 problems.  Checked the McAffe website forums and this was there solution.

 

There are three things that may help.

• Go to Internet Explorer Tools/Internet Options/Content and disable Content Advisor (it will clash with SiteAdvisor)
• Click Tools again and this time check Phishing Filter - turn it off as it too will clash with SiteAdvisor.
• Click the small down arrow at the right of the toolbar SiteAdvisor icon and check if you have turned on Protected Mode. If you have then uninstall/reinstall and leave it turned off this time - yes, another item that can clash.

Some people have found that simply uninstalling and reinstalling (as per the link above) will cure the problem.

 

This leads to my question.  What is better to have, SiteAdvisor or Protected Mode and Phishing Filter turned on? 

 

I have had a lot of problems with SP1, so I am also debating on uninstalling it, then reinstalling, so I don't know if this factors into this problem.  Thanks for any suggestions.