As they say in Ireland, "You can't get there from here..." But let's try.
First of all obviously you'll have to link the computers together. I take it from your reference to a crossover cable that you mean by an Ethernet network. Must therefore assume that you have got network cards in both, a crossover cable and have already set up or know how to set up a network. If not, then assume you want to use Laplink as suggested by newswatcher or Micro$oft's own Direct Cable Connection and have or can get the cables.
Anyway, let's assume that you have already implemented or can implement one of these solutions. Use XXCOPY (not xcopy) referred to in
http://www.pprune.org/forums/showthr...ight=Partition to clone the contents of the HD of C2 to a new temporary directory on C1.
Now replace the HD of C2 with a new HD. Okay, we now have a fairly insoluble problem since the blank HD on C2 won't boot & despite being able to boot DOS 7 with an emergency disk you have no means of communicating with C1.
We all know what you want to do (which isn't difficult) and have been trying to help you do it. Doing what you want to do the way you want to do it is not possible. And yelling at the good fobotcso won't help.
Pay the 30 quid.
[actually I can think of one or two esoteric non-intuitive possibilities to attempt it but none within the range of my sanity.]