NuGet Package Not working in Visual Studio 2015

After updating Visual studio 2015, I am getting the following error when visual studio starts. Nuget Operation failed NuGet.Config is not a valid XML. Path

'.' hexadecimal value 0x00, is an invalid character. Line 1, Position 1.

Also, i cannot use the package manager console anymore.

I tried uninstalling and reinstalling it, but with no success. i am still getting the error above.

Any guidance on how to fix this would be appreciated, thanks!