System crash in IE

Ran Beta1 five times and seem to have gotten rid of most
everything. Am also running Spyware Blaster, Search and
Destroy, Spyware Doctor, CW Shredder, Xoft Spy, Norton
2005 extended. Have current immunizations on
everything. Now system crashes when browsing. Appears
to happen when the system (or whichever of the multitude
of programs I am running!) attempts to block a redirect.
Auto.search.msn.com keeps reappearing no matter what. Is
this the root of problem? Help!!!!