|Sounds more like your nic failed than the ISP was having problems.|
Why you would include vpn and dialup is beyond me since vpn would have to have been setup previously and if using broadband you would never use dialup.
Lets see the results of a ipconfig /all for review.
Look at device manager and network. Nic show up and doesn't have a exclaimation point next to it?
After the crash did you run chkdsk /f? You should run it.
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