It could also be a virus/trojan and not necessarily spyware. Which would account for the ad-removal programs not catching it. I wish someone would make a hybrid virus scanner/adware remover program, so I don't have to have two programs that do the same job.

By the way, Googling for your exact term, " res://mshp.dll/index.html#10213 ", resulted in this page which details exactly how to remove it. Google is your friend.