Avast detects MBR:\\.\PHYSICALDRIVE0 (rootkit "Hurri)

Hi,

Recently I had a warning that Avast detects MBR:\.\PHYSICALDRIVE0 (rootkit "Hurri). It appeared after a friend tried to use an online product key for MS Office!!

I tried to use the following software:
1- TDSSKiller (Tried different ste of parameters
2- Norton Power Eraser
3- Mcafee rootkitremover

They all returned no threat detected but when I run full system scan on avast I end up with the same error about Hurri.

What can I do, please help

http://forum.avast.com/index.php?topic=53253.0