Explorer.exe problem...?

I have had a problem for quite a while with what I think is the Explorer.exe not loading properly. When I turn on my computer, It starts, but the taskbar is inactive completely. When I go over it with the mouse, the hourgl pops up. I sometimes get a bit of luck with the desktop files and folders, but usually if I click on an icon from the desktop, nothing opens, but sometimes folders do. Anyway, after about 5 minutes (sometimes longer), suddenly the taskbar icons suddenly load, the startup sound chimes, and everything is back to normal. everything i try to load during that annoying period suddenly load all at once once the 5 minutes is up. The Ctrl-Alt-Del shortcut doesn't do anything during the 5 minutes, but I've found that creating a shortcut to TaskMgr works, so that I could cancel the explorer.exe and reload it, but it still freezes up. The freezing time used to be about 20 minutes, but I removed about 8 of the 10 viruses I had. Could my remaining 2 viruses (asyncmac.sys, i6pfw) be the source of my problem? Or might it be something to do with a knackered CPU fan or something? thanks for any info. This freezing thing is starting to be a pain in the a** when I have things to do. Thanks again