If you'd have or give the full unabridged litteral error message, it might be possible to google it (put quotes around it, add "ms money" and see what comes up). But that won't work now.
MS Money isn't part of MS Office, so this is more or less the wrong forum. Try PC Applications or Computer Help.
I don't know MS Money, but as I read the message could it be that you configured the old program to code the data on the disk to inhibit intruders to read them? Then you would need to provide the same code here, somehow. Just a WAG.
Hope you find the solution.
Just bought a new pc Celeron 2.6 Ghz, MB P4VM8 VIA PM800 with xp sp2.
Installed MSMoney 98 vs 6. Works fine, but it cannot read the backup files produced under winme. Message that data is coded. Tried every regional setting, but no result.