Please help overhaul of Internet cafes!!

A few days ago, I do not know why the Internet, each computer in the Windows boot start time (Figure windows appear, roll away following article), dropped on the network, into the router is do not look at the data.5 seconds over again Automatically connected to the.
I replaced the router, switch replaced, tested voltage room.There, now I can only force of each machine are open too open burning dry ..very painful.
prawns were invited to lend a helping hand ~!
(boot the machine when this happens, restart the computer when it does not happen)

memory is a big reason.

In addition, all equipped with Internet cafes Cards reduction.so it does not install antivirus software, software protection, and so on up the pace of natural.Of course, step-by-step marks tourism Net idea:speed, memory size, such as running antivirus software, these are factors you know about the trial in which the reasons for it! Kuaiqing to a professional look and see, the Internet search a waste of time