harddisk of internet-pc is completely fu

only 11 mb can be seen on customers 1.2 gb- winme-internet pentium 200. i ws searching for downloaded files(video or whatever) without much success.i have tried all video-endings which irfanview can handle. i cannot find any data which i could delete. of course i will reset-make new setup. but before formatting i would like to see where the ennemies are hidden.