Moving file failed

(THE FOLLOWING IS COPIED FROM MY FORUM POST) First of all, i'm pissed of like never before i can barly type... So let me just type in my problem. Sooo... I'm using free version of unity, and i'm working on the game, well, some time ago, unity started giving me messages that Assembly dll of C-sharp can't compile or something i don't know, it's compiler just can't compile for some reason... And then i get to choose to say force quit, retry or close: 1. When i choose force quit, the untiy turns off, and when i open it back, it can't compile again, like when it's starting a project, it can't compile the scripts, so it gives me the 3 options again 2. When i choose Retry, nothing happens, it still can't compile 3. When i choose close, it just ignores the compiler, and when i update my scripts in monodevelop, it won't apply in the unity, becouse IT STILL CAN'T COMPILE FOR GOD DAMN SAKE

THE ONLY SOLUTION was to reinstall unity, and when i do it, it works, works, and for some time, it does the same problem. So i dicided to get all of my things on other hard drive, and reinstall windows, so i did it... I installed unity on a fresh windows, i tought, FINALLY, FINALLY it works normally, and now after 7 days, IT HAPPENED AGAIN... I'm SO PISSED OFF... GUYS PLEASE HELP ME !

BTW, THE MESSAGE SAYS:

Moving file failed

Moving Temp/Assembly-CSharp.dll to Library/ScriptAssembles/Assembly-CSharp.dll failed: The system cannot find file specified.

And also, i don't have dropbox or anything that interrupts the dlls or something like that. And also, it gives that message for csharp editor, for boo, unity editor dlls, and more i can't write them all down