Up until a couple of days ago, my network and internethad been working great for a long time. Just recently, after restarting my computer from a crash from trying to load to many things at once, my internet keeps logging me off of AIM and I keep getting errors on Mozilla firefox; and my network just stopped working. I have no idea what is affecting either problems. My computer cannot see the network, nor can any of the other computers see it. Computers: - Windows XP SP2 - Windows 2000 - Windows XP SP2 - Windows Vista - Windows Vista I only have one firewall, Windows Defender and I connect through a Linksys Router, by an RJ-45. So far to try and fix/diagnose my problem I have: -Tried manually finding the network by \\computer name and \\IPaddress. -But when I tried to ping the IP through Run... it was able to see it 4/4. -Tried setting up the network again. -Tried restarting my computer, several times. -Tried restarting my internet connection, several times. -Tried flushing then registering my DNS through Run...>cmd>ipconfig \flushdns>ipconfig \registerdns. -Tried turning on UPnP. I suspect that the only thing I can do is to reinstall Windows XP, but it will be troublesome to reacquire all of my programs and to backup all of my files to my External Hard Drive which is currently broken. Thank you in advance.