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#11
It may be worth while to start up in safe mode with networking so as to isolate the cause.
If the problem goes away in safe mode then it's most likely that something installed on the system is causing the problem like a third party A/V software etc..
Running the following file will flush the DNS on this machine and reset the network stack, this may be worth a shot as no problems are showing up in the ipconfig.
You might also want to run the sfc /scannow command in an elevated command prompt to fix any possible system file problems.