Last night I stumbled into a problem that sounds like it's probably a backdoor trojan (based on other posts). Description:
Red pop-up with the title "Windows Security Center system warning"
A red frame inside the pop-up box with the heading "Alert details"; within the frame, "File: avpcc.dll" and "Threat: CoolWebSearch" also appear.
Seems to have disabled task manager; also uses the system tray to alert me that "system is not protected; may be infected!"
I downloaded MalwareBytes and ran a quick scan. Removed all items that were found, but pop-up window still appears and an IE/Firefox browser window opens every few minutes (opens to Google).
Should I download "Combofix" and try to repair with that? I'm basing this on the following posts:http://www.bleepingcomputer.com/forums/t/148186/infected-with-numerous-items-can-only-boot-in-safe-mode/
Still need to download/run DSS tonight--I'm entering this from my work computer and the issue is on my home PC.