If like me you've got Windows Vista, then you may well have system restore points setup to be generated automatically. If like me you've also noticed your PC seems to have it's HDD constantly accessed, then give this a go. Personally I've never use a system restore point, and I don't think I will. Whilst doing a bit of system maintenance I switched system restore off, and not only did I gain 3GB, but my HDD was instantly silent, no more continuous accessing, hurrah! Obviously only do this if you know what you're doing ;o)