Get a small cheap HDD and use that, what are they going to say this is not what we expected well to bad for them. Also I?m concerned about them having you bring your pc into them and paying for the privilege. It is your property not there's so I wouldn?t be inclined not to even take it in. Another option would be to put a password on the windows log in screen. Then there should be no way for them to get into it (without you telling them or them breaking it). You could then use this log in to have your files hidden under another use with more privilege so they can?t be seen. If they decided that it is so much effort find the files and just format the pc bitch and moan that all your assignments and everything on that as wiped and they had no right and so on and so forth.