After combofix has done its thing could you then run a quickscan with Avast to see if the infection is cured
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Close any open browsers.
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Close/disable all anti virus and anti malware programs so they do not interfere with the running of ComboFix.
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Open notepad and copy/paste the text in the quotebox below into it:
FCopy::
c:\windows\winsxs\amd64_microsoft-windows-user32_31bf3856ad364e35_6.1.7601.17514_none_2b5e71b083fc0973\user32.dll|c:\windows\system32\user32.dll
c:\windows\winsxs\wow64_microsoft-windows-user32_31bf3856ad364e35_6.1.7601.17514_none_35b31c02b85ccb6e\user32.dll|c:\windows\SysWOW64\user32.dll
Save this as CFScript.txt, in the same location as ComboFix.exe
http://img.photobucket.com/albums/v666/sUBs/CFScriptB-4.gif
Refering to the picture above, drag CFScript into ComboFix.exe
When finished, it will produce a log for you at C:\ComboFix.txt which I will require in your next reply.