I've cleaned a computer of viruses and malware. The computer is now working great. All software appears to be running fine. This computer is running Avast Antivirus. The problem is that I noticed that Avast cannot update it's virus definitions. I would think this an Avast software problem except that I also noticed that Malwarebytes and Superantispyware (these are there just temporarily) cannot update their definitions either. This tells me it is a computer problem. Apparently the port they use to update is blocked. I don't know how to find out what port or how to unblock. I did notice that I can update in Safe Mode. I looked at the processes when in normal mode and nothing stands out. Any ideas? (I've reset the Tcpip stack and reset the winsock catalog, I've checked the hosts file and it is clear).