The popup from IE is likely some leftover Browser Helper Object that is in IE. The usual Anti-Parasite Suite of Adawre, Spybot, Cwshredder and a pass of Housecall might automatically eject it. Get LSPFIX and how to use LSPFIX handy in case the malware diddled with the LSP.
Hint use http://www.google.com to find these FREE items.
About Mozilla. It's nice too, but I'll leave others to comment on that. In parting, it's not exactly like Outlook of any version. Some like it, some don't.
I downloaded Firefox the other day and am delighted with it -- slow dial-up is faster with Firefox.
BUT, even though I've set it as my default browser, every time I visit a website a Windows Explorer pop-up tells me this website is inaccessible, please try again. It goes away quickly, can be clicked off, and doesn't actually intefere with the connection. But it bugs me. Any way of telling IE to go away except when invited? I may use it again some day (and have already downloaded the patches for the new virus) -- meanwhile, Firefox is just fine.
Firefox doesn't have an email program. Recommend Mozilla's Thunderbird anyone? I don't like Outlook Express.