[Soundgod]

Miss Dis, many people prefer Norton Anti Virus to McAfee's anti virus. I've used Norton AV and Norton Systemworks (Utilities) since my first computer. My first laptop came with McAfee, but I dumped it because I didn't care for it.
The real questions are, how old is your computer, how old is your version of McAfee AV, how current are your virus definitions, do you have a current subscription to updates?
Depending on the answers to these questions, you might do better completely uninstalling McAfee AV and buying and installing Norton AV or Norton Internet Security and possibly Norton Systemworks as well.
I'm not going to try to diagnose your computer problems because that's a lot easier for me if I'm right at the computer in question. I suspect that you could use a good registry cleaning, but without the proper tools, even pros shouldn't rush blindly into that. That is something a Systemworks applet called WinDoctor can be of a great deal of help fixing registry errors.
I'd suggest talking to one of your local friends who know computers for some hands on help.

Oh, and as other people have posted, Internet Explorer, Mozilla Firefox, and Netscape Navigator are web browsers and should not be confused with anti virus or utility programs.

Beyond a good anti virus program, today you need a good anti-spam program as well to help block potentially harmful sites and pop up messages. One of the best is still Webroot's Spy Sweeper. I strongly recommend that as well.

I know, this only gives you more questions and confuses you more, not less, but that's the can of worms that computer problems can be. I'm sorry I can't help more from here.