Internet Explorer 6.0 - can't close web pages

When I am at a web page in IE, and try to "X" out - the page just stays there - can't close. I do a ctrl-alt-del and note that my cpu usage is 100% - (also get little green box on taskbar indicating cpu use at 100%). Looking at what is using up the cpu, it appears to be System. What's the problem? All works ok in MSN or Netscape - just IE 6.0 Should I re-load IE 6.0? - is that the problem? Any help would be appreciated, I'm going nuts over this one!
Thanks

 

Possible Spyware use program like AD Aware or SpyBot S&D.

 

Have both SpyBot and Adaware. Finally (I think) solved problem. Edited registry so that I could re-load IE6. Seems to work ok now.
Thanks for your help.

 

You may have other junk there as well:

Download 'Hijack This!'. http://www.tomcoyote.org/hjt/
Unzip, doubleclick HijackThis.exe, and hit "Scan".

When the scan is finished, the "Scan" button will change into a "Save Log" button.
Press that, save the log, load it in Notepad, and copy its contents here. Most of what it lists will be harmless or even essential, don't fix anything yet.