Well commonly this is something blocking avast's Web Shield, but what I can't get around is the "on occasions not let me open Firefox Internet Explorer 6 and 9." It shouldn't be intermittent problem, it should either work all of the time or none of the time if the Firewall were blocking the Web Shield.
Does the PC Tools Firewall allow avastSvc.exe internet access ?
- If it does delete the entry for it and reconnect to the internet, this should force the firewall to ask permission again.
Also "But the problem occurs again early in my PC." do you mean this happens early after starting your PC ?
If so I wonder if the PC Tools Firewall isn't running at that point and blocks all connections until it is established ?