It was Windows scan disk that you access through properties. Every thursday night I set it up to start when I turn the pc on friday morning 'cos for some reason it'll only let me do it at start-up.
I'm currently zipping the files up to store them just in case but it's taking forever. Shall I stop that and just straight delete or should I use this cleaner prog that you mentioned?
I ran TuneUp utilities after the scan disk, but it didn't find them. If I hadn't had been watching the screen while it was scanning, I would never have known where to look for the missing 12 gb!
Still wondering how it got to be that large an amount of temp files too?