If you've already dealt with the above and are up-to-date at Windows Update,
check your system for hijackware: http://mvps.org/winhelp2002/unwanted.htm.
The steps for using HijackThis and posting to the recommended forum are
highly recommended these days, with all the nasties and variants being
uncovered daily.
Start>Run>MSCONFIG>Startups> uncheck suspicious-looking items and reboot (or
reboot into Safe Mode), allowing IE to remain up and running long enough to
check out the above link.
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HTH...Please post back to this thread