For those who use AVG Antivirus and have recently upgraded from 8.5 to 9.0, some of you might be seeing errors with the AVG Firewall. The Error would say the following "AVG firewall cannot start because an error has occurred in communication with a driver".
AVG is a great antivirus, anti spyware, firewall etc all in one. Its light weight and not as cumbersome as some of its competitors like Symantec and Mcfee etc. The above error only occurs if you have upgraded from 8.5 and you have kept the user settings and firewall profiles. Version 9.0 has only 3 seeded Firewall Profiles "Directly Connected To Internet", "Computer In Domain" and "Small home or office network". Previous version 8.5 had a couple more like "Standalone Computer" etc. I had the same problem. Every time i uninstalled, i kept the user settings and with the new version i restored the old profiles and settings. When i did a clean uninstall of 8.5 and ran the free utility from AVG website "avgremover.exe", it cleaned up all my previous settings. After that i did a clean install of 9.0 and let it select the best possible profile in the wizard mode.
I have not had the problem since then.. Hopefully this will be helpful for others who have the same problem..