I have been running Comodo Personal Firewall in W7 without problems - until the latest update (V 10 I believe) was offered and I followed the installation instructions. This caused the PC to lock up and I could only get it working again by doing a system restore in safe mode. Reading the posts on the Comodo Forum indicates that this problem is not confined to me. I will probably follow the advice and uninstall with Revo but I am undecided about reinstalling (which according to one post appears to overcome the problem) or switch to another firewall. Has anyone any advice or experience? I believe that I once read that the standard Windows (7 ??) firewall was up to the job though I had always assumed that a dedicated application such as Comodo had to be superior in some respects.