Remove Trojan Horse downloader.delf.12.an

I need help in removing a trojan horse from a system.

AVG 8 pops up with the following notification when you open anything:

Threat detected!
file name: c:\windows\system32\corpolw.dll
threat name: Trojan horse Downloader.Delf.12.AN

I have attached a copy of the hijack this log


hijackthis--2-.log
Beaver_TrucksAsked:
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David-HowardCommented:
Have you run your anti-virus in Safe Mode?
Safe Mode:
http://www.computerhope.com/issues/chsafe.htm
You might also download and run malwarebytes. It's a good utility and it's free.
You can get it from:
www.malwarebytes.org
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Beaver_TrucksAuthor Commented:
I have tried safe mode, no dice, it keeps coming back.
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David-HowardCommented:
Disable System Restore and run your suites in Safe Mode again. If you don't disable System Restore it can reappear.
http://www.pchell.com/virus/systemrestore.shtml
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David-HowardCommented:
You may also be able to remove this with combofix. The directions and the free tool are at the link below. Please make sure that you follow the directions as they are not the standard click and run type.
Combofix is known to remove a wide varitey of trojans, etc.
http://www.bleepingcomputer.com/combofix/how-to-use-combofix
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eXpeLLeD_4RM_heLLCommented:
Download Combofix from:
www.bleepingcomputer.com/combofix/how-to-use-combofix
Follow the Steps on how to use ComboFix which is also on the site above
Post the ComboFix Log here once finished
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Beaver_TrucksAuthor Commented:
The Malwarebytes Anti-Malware program solved my issue

Thanks very much
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David-HowardCommented:
Great! You're very welcome.
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