False Positive In Steam Client

When my Steam client did an automatic update tonight avast marked one of the files it downloaded as a virus and stopped Steam from running.
The File was:
sdl.dll
and it was marked as:
Threat:Win32:Malware-gen

I don’t think this is a virus.
What should I do?

Look here http://forum.avast.com/index.php?topic=111784.0 and be patiently.

DJBone

See here: http://www.backgroundtask.eu/Systeemtaken/taakinfo/59106/sdl.dll/52726F9E11C4F2AF64033EE17DAE1FCE/
Check your sdl.dll with: http://www.backgroundtask.eu/Applications/FTR1_Index.php
Download link: http://www.backgroundtask.eu/Applications/FTRCheck_Setup.exe

polonus

I cant download that program. The download link just loops back to the applications page.