Andy Hibbins: is on the right track. i dont think dos can find a unix nfs unless you have samba installed.
also your alternative is to dump the data you want to tape and restore it on the new machine (this being the best idea cuz you will then have a static back up of the data if ever needed again.
check out
www.samba.org. altho if this is a one time thing samba might be more of a hasstle to set up, but it does come handy.
if this is a one time deal then just tar every thing you want and send it over via ftp.
but i will admit samba as a project can be fustrating but it is extreamly useful and fun after you get it working the first time. practice makes perfect.