Mohamed - I am pretty heavily scheduled the next couple of days (have a couple of windows tomorrow afternoon or Friday), but if you have LogMeIn installed, I could log in and see if we can put our finger on what the issue is for you.
To the subject of AV choices, I recommend that you implement appropriate network security instead of hanging your lab-coat on machine firewalls - they produce headaches, and unless you are directly connected to the Internet (ooooohhhh nnnooo Mr Bill!) they have minimal utility for the headaches & performance hits.
If you are going to pay for software, I recommend Sophos, which has been displacing several of the mentioned above at organizations large and small.
