this only works if you have any way going to your router,
like through wireless-lan or other working PCs that can access your router address
Do this on your working PC or Laptop with access to router
* settings vary with router brands
go to 192.168.1.251 ( my address )
Configuration -> LAN -> Ethernet Client Filter
* click Allowed
click on MAC Address List Candidate -> Active PC in LAN
* make sure your disabled PC is connected to router or it wont show up in the list
* you can try entering MAC address manually MAC address
* if it doesnt show up something else is wrong
MAC address for disabled PC is added to the list
* Click Apply
Go to the Disabled PC
* the one with the unidentified network issue
RUN ncpa.cpl
right click on Local Area Connection -> Disable -> wait 10 secs
right click on Local Area Connection -> Enable
I have to admit im not sure how this worked for me, some settings might have been changed in the router accidentally
would be nice if someone can benefit from this solution, if none of those posted fixes helps
-khyle