I suggest seeing someone who deals with your IT at the school. Perhaps go to see someone in your Student Services department or ask a professor who might know who to talk to. Chances are there is just an error in your student account - or perhaps you might need to get everything reset.

It's possible your project is located in a folder your account no longer has write-access to for some reason, so when Unity opens and attempts to work with its scene files and the library folder under your project, it is denied access by the OS.

Try to get Unity to open a blank project instead. You can do that by renaming or removing the project folder - it associates its project with the folder name that contains it. This should cause the editor to bring up the Project Wizard that lets you pick a project to load from a list or create a new one. If that works, try to create a new project and then copy the scene information etc. from the old one into the new project's folder.

Err... Finally, a question: You're not working from client terminals, by any chance? That is, your computers are in fact actual, local workstations, and not just some virtual desktop session granted to you by a server, which then wipes the drive after you log out? If so, you're screwed. I once lost a quite extensive school report because in my noobness, I hadn't realized Word's save-location was set to a temporary desktop-session drive. It sucked.

i am getting the same error message: operating system error access is denied. id: eWin : 5 / RKey :320 i downloaded unity on another acc but relized that i was on the wrong acc i moved unity 2 shared documents then clicked switch user and moved unity 2 the right acc. it works fine on the acc that i downloaded it from but when i try 2 play on the acc i moved it 2 and need it on. it says operating system error access is denied. id: eWin : 5 / RKey :320 both accs r admin acc and the person i moved it from wont let me on there acc 2 play it.