McAfee and I aren't friends so I hesitate to endorse anything of theirs. You might try the WOT add-on for firefox or better yet, uninstall MSSE and uninstall the free Avast. It's a really nice anti-virus and has a site checker. Plus it has a great boot-time scan which solves most malware problems and will block access to a site that tries to do something funny.
Download and Save the free Avast installer.
Uninstall Microsoft Security Essentials
Install Avast by right clicking and Run As Admin. (Register when it asks you - they will try to talk you in to buying the full product but the free version is what we want.)
If you feel you need a firewall then the free Online Armor http://www.online-ar...-armor-free.php
can be used with Avast.
If you try Avast: Some people object to the voice notification of updates. To turn it off, click on the Avast ball then on Settings. Then on Sounds and uncheck Automatic Updates OK. (It will still update it just won't tell you about in a loud voice in the middle of the night.)
They have also started using their info popup to try and get you to upgrade so I go into Settings, Popups and change the first two to 1 second.
The registration is good for 12-14 months then you will need to register again. They will, of course, try to talk you into buying the product but you can always register again for another year free tho it won't be the default option.
To use their boot-time scan: Click on the Avast ball. Then click on Scan Computer, then on
Boot-Time Scan then on Settings. Change the Ask at the bottom to Move to Chest. OK then Schedule Now. Reboot and let it run a scan. It may take hours.
Once it finishes it should load windows. Click on the Avast ball and then on Scan Logs, select the Boot-time scan report then View Results and it will tell you if it found anything. A text version of the report is at: C:\ProgramData\Avast Software\Avast\report\aswboot.txt