Thanks for the welcome! We have Windows XP, and were using Iolo AntiVirus, Iolo Firewall, and System Mechanix, all of which have been removed in attempt to resolve another problem, which I posted under the Broken.open topic in these forums. The problem didn't get resolved and we're still having this annoying popup. The broken.open problem is gone, but now my boss can't send emails, which is also under the above topic. Because of this, I am reluctant to run anything I don't know. Would you please tell me about this: mbam-clean.exe Also, can you tell me how safe the programs that are suggested here are? I've noticed titles under Member names. What do they mean? How can I tell if a member is from Malwarebytes or from somewhere else? Thanks for your help.