Antivirus updates affecting pat software

I received  and update for my antivirus software. I am using Windows Live ONECARE from microsoft. Soon after that PAT would not connect to the server.

The reason why my machine was not working was because  I had changed the system date from 9th July to 9th August.  This put the above software in chaos for some reason.  When I had changed the date back to the correct date ie today's date the Firewall on my system was still down.  I had to ring the help desk and then through PC anywhere software, the chap put a code in my system and now PAT is working.  I got there in the end but it took three days. 

I hope this helps any others who have the above antivirus software - do not mess about with your system dates.