Since you were "messing around with" the Add Hardware section, it might be worth updating your wireless adapter driver for the computer.. Occasionally, the driver can become damaged and a new updated version will help things immensely. Check "Device Manager" for the driver name and manufacturer, version number, and version date, then visit the manufacturer's website to find an updated driver.
Hope this helps.
My wireless connection for my PC has been ridiculously slow since last night. Websites seem to take forever and a day to load and WoW is out of the question. Today the connection at least seems stable as last night it would keep dropping and then couldn't find the network again (although I could see the neighbours'). I restarted the PC, reset the router, blah, blah, all the things dumb people do when faced with computer problems (except physical violence ... so far). To see if it was the PC or not I set up my laptop on the wireless network and it was perfectly fine.
Before this happened I was messing around with "Add Hardware," trying to get my printer to work - could that have ruined me somehow? I'm running Vista, btw.
Please let me know what more information is needed (and maybe where to find it) and I'll post it right away.