My pc's wireless internet completely stopped working about a little while ago, it is aware of our network but doesn't connect. I've run anti-virus programs on it, replaced the wireless card, and even moved the computer next to wireless box and it doesn't connect. it worked very well with it, then over the period of a week it just sortof started dieing then stopped working..

My mac works fine with it, which is what I'm on, but it's very slow.

what could i do to fix it\ what's wrong with it?

Moderator Edit: Moved topic to more appropriate forum. ~ Animal

Restart everything. Unplug the modem and router. If they have battery backup remove it also. Turn off your computers and nay network devices you may have. Wait one minute then the modem on. Wait an additional minute and turn the computers and network devices on (if you have any).
This should reset re-allocate your network settings.

This has been done many times to it, indirecly.. but still been done. we've gotten different internet boxes, the computer's been taken apart a few times...

Have you swapped cables (ethernet)?