From MS:
http://support.microsoft.com/kb/890830"However, if malicious software infected the computer before you installed an up-to-date antivirus program, your antivirus program may not detect this malicious software until the tool tries to remove it."
If you feel confident that you do not have malware, then I can only offer you the link to MBAM as another option:
· Download
free http://www.malwarebytes.org/ for an on-demand scanner.
· Double Click mbam-setup.exe to install the application.
· After install, click
update so you have latest database before scanning.
To confirm, you have listed ALL your past and current security software?
While we have been online you have
removed McAfee and rebooted? Is your problem fixed now?