At present, I am a Network+ and A+ technician self-studying for my Server+ exam.
What was the last thing you did, was it installing the McAfee trial? Was there an antivirus installed on the computer before? Was it removed?
If it was removed, then there is another problem.
First, were you allowed to check your email prior to installation of the trial antivirus software.
If you were, then more than likely it is the antivirus software and there can be a possible corruption with the software or maybe it could be spyware.
Some site can be pretending to be the real thing.
Try running Ad-Aware 6.0 on your computer or Spybot Search and Destroy 1.3 to detect any adware or spyware. Just make sure to check all the settings. If you go for the full version, then you have email detection and other features.
If you can't access any other files using your computer or logging in on someone elses, then more than likely you have a permission or user rights problem and that's relating to the server.
If only one or two people can't access their email, then check a hub or switch to see if there is a bad port.
You will also have to run ping 127.0.0.1 pinging the loopback address to see if TCP/IP stack is installed right on all computers.
Try pinging by IP address or computer name. Use tracert to find out the route of the network which has failed.
Research the stuff I have told you (if you haven't already have) and these commands will help you.
If you have any further question, post them or send them via email to me.
I'm interested to hear how this works out.
