General help

I actually do the same thing at my college. I have a training Moodle that wipes every night at midnight. It does require moderate technical skills, but here's exactly what you want to do:

• Set up your Moodle the way you want it. You might want to include a few sample courses, or give lecturers extra permissions (e.g. course creation). This will be the "clean state" that your Moodle will be restored to.
• Take a backup of the Moodle database, the webroot (where Moodle's PHP files live) and the moodledata folder.
• If you want to restore your Moodle to the clean state, all you have to do is overwrite the Moodle database, webroot and moodledata folder with your backups.

If you want to automatically do this every so often, you could write a script to do it. I have one in my Linux crontab. You might be able to do it in Windows with scheduled tasks.