Was just scrolling topics in the WoW forums, when my browser shrunk and became a popup that said something like "Your computer is running slow; download PC Optimizer now!" with a Yes or No button. I clicked the X in the upper-right-hand side, but instead of closing, the window went to the PC Optimizer page, which I then hurriedly X'ed out of.
Was this an ad? I have another browser page open, and the only one that was affected was the Allakhazam page. If not an ad, any recommendation on how to scan my PC and get rid of a potential keylogger/virus?