It could have been something as simple a dirty IE cache that was cleaned on a reboot.
Since everything seems to be running better, I'll give you my All-Clean speech now. Let me know if anything else arises in the next few day.
Reset and Re-enable your System Restore to remove bad files that have been backed up by Windows. The files in System Restore are protected to prevent any programs changing those files. This is the only way to clean these files: (You will lose all previous restore points which are likely to be infected.)
1. Right-click My Computer, and then click Properties.
2. On the System Restore tab, put a check mark in the 'Turn Off System Restore' check box.
3. Click OK, and then click Yes.
4. Restart the computer.
5. Repeat steps 1 - 2, this time clearing the box beside 'Turn Off System Restore', click 'OK'.
I suggest that you download these programs to help keep the computer clean:
Spyware Blaster - Blocks bad ActiveX items from installing on your computer. Spyware Blaster runs silently in the background.
ie-spyad - Puts over 12,000 bad URLs into your restricted sites for Internet Explorer.
Google Toolbar - Blocks many unwanted pop-ups in Internet Explorer.
Firefox - 'Safer' alternative to the Internet Explorer web browser.
ZoneAlarm -
Free firewall program if you currently are not using one.
Update these regularly.You may also want to read
"So how did I get infected in the first place" to learn how to better secure your computer.
Be sure to keep Windows and your Anti-virus updated.