Someone please help. I have had to replace network cards on 3 desktops running winxp and networked together about 3 times in the past 3months.
It is funny that a desktop working perfectly the previous day will simply refuse to connect to the network. Upon troubleshooting, I will discover that the network card is bad. I have had to use cards from different manufacturers, but the problem persists.
I have lost both network cards that are unboard and those that are PCI to this problem. I suspected that the problem might have something to do with electricity, so I ensured that all the desktops are plugged to UPS and not directly to the mains.
Yet the problem persists. Someone that have an experience on this should please suggest to me what I should do.
Thanks.

you may need a surge arrester .for both your power supply and your network cables. also, u need to confirm if you have any items like photcopiers, printers, irons connected to your mains as these can generate surges. you may also want to consideer a voltage stabiliser, tho that may not help that much if its not an industrial one that out puts 0% fluctuation .
cheers