I'm assuming you are using Firewire to import from the VX--2100
What you might be experiencing is a known issue with Firewire on both Win 7 & Win 8. This is a Windows driver problem.
If it is, you can try rolling back to a legacy Firewire driver. This sometimes works (though not always).
But the simplest solution would be to use your old system for Firewire imports -- saving to an external USB drive -- and then bringing that drive to the new system.
(Its what I do if I need to do a Firewire import on my Win 7 machine.)