Delete Internet Explorer Add-On

I've got this strange add-on named: "nnnmkKCR.dll". I think it is some kind of malware, because windows explorer keeps restarting until I disable this add-on. IE only lets me disable it and not delete it. Everytime I restart, it's back.
How can I delete it?

Hello Pete,

So does the same thing happen when you reboot into Safe Mode to then
eradicate the pest?

Please let us know if the problem remains

Hi Pete,

Forgot to ad

Using Internet Explorer, have the system scanned here:
<http://onecare.live.com/site/en-au/center/howsafe.htm>
-=-

Do a full scan with MalwareBytes and SUPERAntiSpyware.
SUPERAntiSpyware, together with Malwarebytes Anti-Malware, are free malaware
scanning application's

A very good antimalware app is SUPERAntiSpyware.
There is a free version (on demand scanning only), the paid for version
includes active monitoring, similar to Windows defender:
<http://www.superantispyware.com/>
The trial version of SUPERAntiSpyware Pro (SAS):
<http://www.superantispyware.com/superantispywarefreevspro.html>
-=-

Malwarebytes Antimalware
<http://www.malwarebytes.org/mbam.php>

If you think it is Malware, try this Program to remove it.

http://www.malwarebytes.org/mbam.php

Malwarebytes is as the name says, a Malware Remover!
For the Free version scroll down their page to either download from
Download.com, or Major Geeks.com

Download, install, and update.

Thanks all, I've managed to delete it by using unlocker and a program called "Remove toolbar buddy". (it attached itself to lsass.exe in the system32 folder)