we have three computers on our network. my desktop, wired to the router, my laptop, using a wireless connection, and another desktop, using a wireless connection. my desktop is working fine, as is my laptop. the other desktop, all of a sudden, the internet stops working. another weird thing is that it automatically switched from teh windows XP theme to the "classic" theme, and all other themes have disappeared from the list. i checked out the "network connections" and it's now empty, as os "my network places." it won't let me bring up the "system" in control panel, andi t won't let me set up a new network (the network window just won't come up). what's going on?