try avast Cleaner in SafeMode first,
I’d like to know if it works then (or any error messages)

After this, Use both Tools below

FsKlez or F-Klez

F-Klez is a utility that disinfects a computer infected with Klez worm and Elkern virus that the worm drops.
To remove Klez.E, Klez.F and Klez.H worms please use the KlezTool utility below.
Download: ftp://ftp.f-secure.com/anti-virus/tools/fsklez.exe
Readme: ftp://ftp.f-secure.com/anti-virus/tools/fsklez.txt

KlezTool

The Kleztool is the utility to eliminate several variants of Klez virus-worm infection and to disinfect files infected by Klez. The utility should be used together with F-Secure Anti-Virus as this tool doesn’t disinfect Elkern.A and Elkern.B virus variants, that Klez.E and Klez.F worms drop. However the utility is able to disinfect files infected with Elkern.C virus that Klez.H worm drops.
Download: ftp://ftp.f-secure.com/anti-virus/tools/kleztool.txt
Download: ftp://ftp.f-secure.com/anti-virus/tools/kleztool.zip :wink: