Assembly-Csharp-firstpass.dll?

Every time I delete a script I get a compiler error that says that the file Assembly-Csharp-firstpass.dll is denied. It's extremely hard to fix. How do I stop from getting this error?

 

http://answers.unity3d.com/questions/614570/how-do-i-get-rid-of-assembly-csharp-firstpass-and.html
(First hit when Googling for "Assembly-Csharp-firstpass.dl" )

Only use this specific forum for documentation related topics, not general support requests, please

Best regards, Rasmus

 

Thanks. I've never reported a file problem so I had no clue where to put it