Internet Explorer Causes Your Computer to Restart

The Problem

Interesting job I had in the shop today. Windows XP Home sp2 and Internet Explorer 7 on an old hp. The computer would restart everytime Internet Explorer was opened. It never even fully loaded. The computer has AVG 8 free edition so my first thought was a Windows issue. But I have a system diagnostic routine I follow on every machine so using my own security tools, Malwarebytes anti-malware and avast anti-virus I find that 309 files are infected.

Internet Explorer had 4 toolbars installed. Several instances of Vundo, and several generic trojans.

The Fix
Begin by removing all toolbars in add/remove. There is no telling which one is casuing the issue, you can always install the one you really want later.

Download and run Malwarebyte Anti-Malware Here
Let it remove what it can.

Disable or remove any anti-virus software you have installed
Download and install Avast Anti-Virus Here
On installation schedule a boot time scan.
When asked to reboot Cancel.
Open Avast and update it. When the update is complete restart your computer.
Follow the scan as it will ask for your permission on the action for each infection found.

When the scan is finished and the computer has been cleaned it will boot to Windows.
Run a final full scan of both programs to be sure you found all infected files.

Hope this helps some of you :)