I can see this being a problem here soon, I'm hoping to keep this under control using a couple of methods, local c: access restrictions, deleting disallowed files (exe's and the like) and I've written a simple script which opens all student files and reads the contents, if the file if pretending to be something it shouldn't be or if it contains banned meta-data (ie games save from the internet) it deletes the files. The application whitelist and the file content reader only went live yesterday so there's no evidence whether (or not) its worked yet.