Ignoring for a moment, the plethora of hardware differences you will have between one machine an the other which will moke the system close to inoperable once it boots.
If it is returning the invalid system disc error, its either not finding the drive to boot from it, or its not finding the files needed to boot on the drive.
Is there another hard drive connected to this machine or is this drive the only one there?
If BIOS sees the disk it should attempt to boot from it.
If you use a win98 bootdisk, can you change to C: from command prompt and browse the drive that way??
If you don't have one, you can download one from here :
http:\\
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Ignorance is not necessarily Bliss, case in point:
Unknown has caused an Unknown Error on Unknown and must be shutdown to prevent damage to Unknown.