In the end I just decided to restore from my Acronis TrueImage backup image which I made last Monday which meant I had to backup a lot of files that had changed but I managed to get everything restored and I don't think I've lost anything.
I uninstalled ZoneAlarm which worked fine and then I installed PC Tools Firewall again and the problem came back with the same error whenever I tried to open programs. This time I tried restarting in safe mode and uninstalling PC Tools Firewall and it worked. When I restarted in normal mode everything was fine again so I installed the latest version of ZoneAlarm and everything seems to be working fine now.
Thank you for the help and advice.
...
''This time I tried restarting in safe mode and uninstalling PC Tools Firewall and it worked. When I restarted in normal mode everything was fine again .... ''
^Как мога да го направя това