Regarding the internet problem try these command in DOS whenever you have a problem in internet surfing
Try these command in sequence given above you might solve the problem.
if metalfreek's solution doesn't work, try to reset it.(not restart but reset)
and for usb, try the following:
click "safely remove ..."
then unistall/install driver for USB
try and tell did it work
Don't uninstall the USB driver, it may remove your ability to use USB drives. For the command above (ipconfig) in Vista search type "cmd" then right click the result and click "Run as administrator."
Users in Vista (weather administrative or not) actually run in limited user mode, to reduce the installation of viruses so that may cause the error above.
I can refresh my ip adress now, but that doesn't solve my internet problem. I can still play multiplayer games and use other internet related applications though, but I can't use firefox nor IE. The other pc's connected to the rooter are still capable of using normal internet.
Did you check your firewall and anti-virus?
Sounds like a DNS issue if you can ping but name resolution does not work.
Try going to the tcp/ip properties for your network card and putting changing your dns to use
220.127.116.11 and 18.104.22.168. Then at least you will know if your DNS server is the cause.
As far as I have collected you are using internet for more than one computer so, just go to your network configuration and set Obtain IP address automatically and Obtain DNS address automatically.