Rozwiazanie:

1. Go to command prompt and type regedit


2. When regedit opens, locate HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state


3. ImagePath Data was %SystemRoot%\Microsoft.NET\Framework\v2.0.50727\aspnet_state.exe so altered to %SystemRoot%\Microsoft.NET\Framework64\v2.0.50727\aspnet_state.exe


4. Go to Services and start ASP.NET State Service

Źródło: http://thelittlewolfsadventuresindotnet.blogspot.com/2010/03/aspnet-state-service-system-cannot-find.html