Question: I have a net cafe which includes 15 pc's all working ok except the server which hangs and locks up several times. My pc is p4 2.8 GHz ram is 1 GB and I have 2network cards one is built in and the other one is free I use one to get internet from the Linkstar receiver and the second is connected to the switch which distributes the internet to the rest of the PCs.
Answer: A computer that hangs can be caused by many different things. Do you have any type of firewall protection on your server? If you have a high speed internet connection coming straight into a computer with no firewall you are asking for trouble. I recommend a hardware firewall over a software firewall. Even one of those cheap DSL routers is better than nothing.
Does this computer get used for web browsing? If so you should do the usual virus and spyware checks to make sure you are not infected.
Another thing you can do is to check your event logs to see if there is any indication of what happened after the computer locked up. After you reboot go into the Event Viewer and look for any events around the time of the lockup for information.
Faulty hardware can also cause your computer to lock up. Unfortunately that can be difficult to diagnose. Bad RAM, CPU, motherboard or power supply can cause that sort of behavior.
If your computer is running hot it can cause problems as well. Go into your BIOS and check your CPU temperature and fan speed and make sure they are in range of your CPU specifications.
If you are running XP you can even try a repair installation of Windows to try and clean it up. A repair installation will keep your settings, programs and documents intact. You should back up just in case though.