Help! Virus disabled my Avast and Malwarebytes

I was installing a Skyrim mod and it was apparently infected with some kind of virus.

Now my Avast won’t start, my malwarebytes doesnt open, and my internet is really slow.

I’ve tried updating Avast but it fails, all the shields say “Shield unreachable” when I try to start them. Malwarebytes doesn’t open at all it just says file not found.

What kind of virus can disable antivirus anyways? I thought antivirus can only kill virus, not other way around?

Thank you…

What kind of virus can disable antivirus anyways? I thought antivirus can only kill virus, not other way around?
do you also think that only the police have guns.... and not the bad guys

lots of info if you google search
http://www.spamfighter.com/News-17202-Study-Reveals-Fresh-Malware-Breed-can-Disable-Anti-virus-Defenses.htm

follow this guide and attach logs…not copy and paste http://forum.avast.com/index.php?topic=53253.0

run in order listed
AdwCleaner / Malwarebytes / OTL / aswMBR

when done, malware experts will be notified and help you
when finish, all tools used will be removed