Problems with IE 6.00.28... possible virus??

I am having trouble with Internet Explorer...
Whenever I am typing in a browser screen... ie(now) and i press the Enter key, IE makes the window 'inactive' (i don't know if this is the right word... sorry i am not good at computer lingo) and i have to click back in the window to keep typing.
This happens all the time and makes writing emails tedious. I was wondering if anyone else has this problem or knows how to fix it...
Thanks in advance!

 

First please get Spybot S&D to clear out most of the spyware.

Short tutorial and download link here:
http://tomcoyote.org/SPYBOT/

Fix everything SpybotSD labels in red.

Then after reboot:
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.