Net use – System error 1920 has occurred

I found the solution. Apparently, it did not register my .NET 4.0 installation. I simply had to run this program with parameters: "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe -i", and it fixed it!

Note that the path "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_regiis.exe" may differ according to what version of the .NET framework is installed!
To see what path you need, open "C:\Windows\Microsoft.NET\Framework\", and see what the folders name is, and adjust it accordingly, like so: "C:\Windows\Microsoft.NET\Framework\<version>\aspnet_regiis.exe"

the right click -> 'run as admin' feature is the windows equivalent of sudo (or as close as microsoft can make it) when you attempt to map a network drive, it needs to perform some admin tasks.

I've gotten around this by creating a batch script (or equiv) then in the properties of the file set it to automatically run as an administrator.

http://technet.microsoft.com/en-us/magazine/ff431742.aspx has some more details about how to do that.