I had a similar issue after installing SAS. I could update AVG and I could update MBAM but I got an error message about the firewall could be blocking SAS from updating. It may help to look at IEx settings under TOOLS > Internet Options > click on the CONNECTIONS tab and check LAN Settings. For most users nothing should be checked. Specifically there should be no check for Use a Proxy server (I do seem to remember at one time that if you were using the free Zone Alarm and Avast! you needed to use the proxy feature for compatibility). I know some malware programs like to use the proxy for redirection. I hope this helps.