My laptop has decided that there is something wrong somewhere and displays "error loading operating system" whatever I try. My only legit disks are Win 98 and the update to Win XP. Laptop won't accept them. Just displays "error loading operating system". I need completely to format the hard disk - I think - to load my legit Win 98 but how? I can get into ms.dos but can not find the correct commands to format the hard disk. I get as far far as: "A:\> " and have tried all sorts of commands - but not the right one! Can anyone help please? Bear in mind that there seems to be no operating system available! Thanks a lot. (The laptop is an aged Dell Lattitude C800 that I bought second hand - it had a pirated Win XP on it and I got into this position trying to remove the pirated OS in order first to install my legit Win 98 and then to update to Win XP with my legit update disk - and now I can't even get to the pirated XP - Grrrr)