When you run the Retrieve Prior Year function, try using the system administrator password, which would be SYS ans password SYS if you haven't changed from the default.
If this doesn't work, then a pointer file has changed since that prior year, perhaps due to changing networks and drive mapping. In the directory that contains the prior year back, rename the file ADSPROF.dat, where 'dat' is your data extension. When you retrieve the prior year data now, you will be asked to re-enter the currency and eztasks paths, which you should acept the default. Then you should be good to go.
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Regards,
Softrak Tech Support