A salesman just popped in to my work to demonstrate a new P.C which was supposedly stitched up so that users could not harm it in any way.

It took me 12 seconds to have it sitting at the command prompt saying Format Y/N

step 1 . he had told me that it would not boot from floppy etc.

I booted to windows. Run notepad. Added format c: to autoexec.bat
reebooted
job done (well o.k technically I had to wait to press y at the format.com prompt.)

When will these sales poeple learn that the only way to stitch up a p.c is to remove the power cord.