a bit more clarification is needed: for example, does the PC has any OS installed on it? are you trying to install win 98 first or lycorus first?
If you had linux installed on the whole HD before, for some weird reason windows setup disk can not read the HD and/or format the HD. you have to use the HD manufacturer's setup disk or any utility like kill disk (http://www.killdisk.com/
) to low level format the HD before you try to run the windows setup disk.
It is stated many times by many linux pundit (i am not one of them, i am a newbie too
) that in dual booting, it is always wise to install windows first otherwise windows tend to wipe out GRUB and can also unnecessary complication.