Since you are having the same problem with two different PCs, it is unlikely there is a hardware problem with both of them. So we are looking for some type of software issue/conflict etc.
The main suspect would be a software app which you installed on both PCs. If you installed NIS on both PCs, that would certainly be a suspect. I would uninstall NIS and use some other AV app. A 30-day free trial would be plenty of time to determine if uninstalling NIS helped.
I also don't think you have the same virus/spyware issue on both PCs.
Your recent replies have been helpful in focusing on the problem. If you think of anything else, reply with that info.
In the meantime, as a workaround, I would use whatever alternative browser you like. Just use IE6 for the windows critical updates. Sounds like you are doing this already.
Here is a good quote from Wikipedia:
Much criticism of Internet Explorer is related to concerns about security: Much of the spyware, adware, and computer viruses across the Internet are made possible by exploitable bugs and flaws in the security architecture of Internet Explorer, sometimes requiring nothing more than viewing of a malicious web page in order to install themselves. This is known as a "drive-by download": an attempt to trick the user into installing malicious software by misrepresenting the software's true purpose in the description section of an ActiveX security alert.
While Internet Explorer is not alone in having exploitable vulnerabilities, its ubiquity has resulted in many more affected computers when vulnerabilities are found. Microsoft has not responded as quickly as competitors in fixing security holes and making patches available. Not only are there more security holes discovered in Internet Explorer, but these vulnerabilities tend to remain unpatched for a much longer time, in some cases giving malicious web site operators months to exploit them before Microsoft releases a patch. Several companies maintain databases of known security vulnerabilities that exist in Internet Explorer, for which no fixes have been published by Microsoft. As of November 27, 2006, Secunia reports 3 unpatched vulnerabilities in Internet Explorer, of which the most severe vulnerability is rated "moderately critical". In contrast, Mozilla Firefox, the main competitor to Internet Explorer, is reported to have 1 unpatched security vulnerability, rated "less critical."
In May 2006, PC World rated Internet Explorer 6 the eighth worst tech product of all time.
end quote.
J.
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