Upgrading from 95 to 98

I received a computer from a customer who wants me to upgrade from 95 to 98. I upgraded the memory from 32 to 64MB pc66. Next I reformatted the hard drive to do a clean install of 98 because this person does not have any of the software for this computer. All I have is Windows 98 for PCs without Windows. Anyway the formatting went find. When I inserted the 98 boot disk, I received an error message saying non-system disk replace and strike any key when ready. Well, I get this error message with the 95 boot disk and when there is not a disk in drive a: I think I need to make an emergency recovery disk and try this. HELP!!!