User Profiles

ok, Here's my situation - I work at a school with 200+ computers, we have 900 students each with their own log in. Now we've gone to a web server for storage of their files, and what I want to do, is every time they log off, or log in, all the inactive profiles get deleted. I've tried to recall my batch file days and lets just say I had some issues. I've tried Delprof.exe off Microsoft.com, but it only works if you are logged in as administrator. I need this to be completely automated, as I can't even get some of the teachers to log off the computer when they leave. Pahleeze Halp!:cry