Navision Attain 3.10 on a Apple Powermac

I am having trouble installing a Navision Attain 3.10 on my Apple Powermac G4 using Virtual PC ver 6.0, either under Win2000 Profeesional or WinXP Profeesional. The client installation program works fine on my Dells running Win98 Win2000 Professional and WinXP Professional, but fails under the Mac. All connections to the LAN work great, other pc programs load on the Mac, but not Navision. We are a small 12 user network, with Windows2000 server. Does anybody know what the problem is?? Or am left only to use Windows Terminal Services or Citrix (which I wouldn’t use because of cost) Thanks Curt Roth