Access: Local Only, not wireless...Internet won't work!?

My 3 year old desktop computer running Vista has never had a problem connecting to the Internet. Yesterday I unplugged my Internet and plugged it into my sister's laptop, also running Vista. Later I plugged it back into my computer and now it says "Access: Local Only" on an unidentified network. I... show more My 3 year old desktop computer running Vista has never had a problem connecting to the Internet. Yesterday I unplugged my Internet and plugged it into my sister's laptop, also running Vista. Later I plugged it back into my computer and now it says "Access: Local Only" on an unidentified network. I tired plugging it back into my sister's computer and it worked just find. I have tried system restore and shutting down. I have looked online and found this problem about wireless, but not about when your plugged in! What else can I try???
Update: tried unplugging overnight, still does the same thing
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