Installation for IE 7 includes two unusual requests. One, Microsoft asks that users briefly disable antivirus protection. Microsoft claims that there have been some conflicts between IE 7 installations and some antivirus engines, so to err on the safe side, the software giant asks that you disable your antivirus protection until the installation is complete. Neither Mozilla Firefox nor Opera make this request. Microsoft uses its own malicious-software removal tool during the installation of IE 7, and it is perhaps this tool that conflicts with some antivirus apps.