I have firefox. Do I need Internet Explorer 7 to use all my programs?

I had Internet Explorer 8 and I took off the coast because my computer was so slow and still frozen. I think it's security for Internet Explorer 8 which caused the problem (McAfee). I have my Microsoft Security Essentials security system. Since arriving at the coast of Internet Explorer 8, I do not seem to have a problem with slowness. I just need to know if I need Internet Explorer '7' for Outlook Express and other Microsoft programs. I keep getting security functions that want to update Internet Explorer 7. I don't want to update because I fear that it will slow down my computer again. If I need Internet Explorer 7, should I update safety? I hope someone can help me.

Yes, you need to update IE7 with security patches. Many aspects of Windows use the underlying components of IE, especially Outlook Express 6. Note that Firefox uses no components of IE to view the pages, so if Firefox is slowing down, that would be another reason, to determine.

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