if you want a malware check…

follow guide and attach the requested logs (not copy and paste) http://forum.avast.com/index.php?topic=53253.0

run in order listed
AdwCleaner / Malwarebytes / OTL / aswMBR

when done removal experts will be notified and check the logs for infections…

if trouble running any of the Tools, try run from safe mode…