I was surprised to find one of our XP SP3 PCs running Eset Smart Security 4.04.. failed to block the "spyware protection virus" which seemed to block every action to stop it. It was one of these scamware programs suggesting the system was infected with all kinds of nonsense. it wasn't, of course, but, for the user it was very concerning. The scamware seemed to disable Eset, it would not allow windows task manager to stay open, and blocked any antivirus or antispam .exe file from running. Rather than spend all day fighting the thing, I decided that a system restore and backup data restore would solve the problem. Although it took a good 6 hours to recover the system, i'm somewhat upset that eset didn't put up a better defence.