IE is tightly integrated into the operating system which means that sometimes reinstalling IE wont even fix the problem and you end up needing to reinstall the entire system from scratch. Other...

I have several different spyware detection programs installed and run all of them on a regular basis. None of the programs detects all spyware, you need more than one for full coverage.

Why is it unnecessary - AdWatch scans for spyware and adware that is trying to install itself on your computer while antivirus software scans for viruses - two completely different things.