Cannot Network XP To Windows 7 And KVM Switch

I have an old XP machine with many useful but obsolete programs and history.I have a new Win 7 HP (home premium) HP Slimline.I have a KVM switch allowing me to control each independently through one keyboard and mouse.I have several external drives, DVD drives and a wireless mouse hooked to the W7 by USB.Each computer is wireless connected to Internet via a Verizon MIFI2200 (essentially a G3 mobil phone).I have no other suitable optioons for internet available in my rural area.I ran the network setup wizard on the XP and saved a copy to thumb drive problems:

1. The W7 computer won't recognise the setup.

2. The XP doesn't show the network I set up although no errors showed up.

3. Win 7 has removed any wizard and other programs from HOME PREM for setup a network.

4. I attempted to set up the W7 manually but it refused too alllow both computers to independently use the MIFI2200.I find all hardware works fine the way I now have iit configured, but I want to move files from old to new PC and I need printer sharing until I get organized. I also need access to an external drive to backup files and general storage from both compputers.