Have you tried unchecking "Display a notification about every script error"? (Tools | Internet Options | Advanced)

Have you cleaned your machine with SpyBot ([url]http://www.majorgeeks.com/download2471.html[/url]) and/or Ad-Aware ([url]http://www.lavasoftusa.com/support/download/[/url])?

It may be a good idea to disable System restore ([url]http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2001111912274039?OpenDocument&src=sec_doc_nam[/url]) before cleaning.