|OK, well we've about done that to death but I wanted to be crystal clear about it.|
You have no Windows installed at all. The only thing on your hard disk is a command.com file, which was probably put on by your diagnostic disk (whatever that is).
What you need is a Windows 98 disk, preferably Win 98E (second edition). Maybe you can find one on eBay - assuming you haven't got one already. I probably shouldn't say it on here but product keys are not such a big issue on W98 - there is no authentication which came along with Win XP onwards.
If you have a disk (or can get one) we can then help, if necessary. Best step would be to at least reformat before a new Windows install.
Always pop back and let us know the outcome - thanks