The workaround is as follows. Vista creates a hard disk drive D as well as a drive C. If you feel confident in doing so, create folders on that drive D to emulate the path that Generations is requiring.
I know someone that has done this and it works fine.
That path appears to be coded somewhere within Generations because I cannot find it in the Registry or by conducting a text search on the Generations folder.
Another workaround is to set the Destination of your report to be a RTF File which you should be able to save wherever you wish, and subsequently open it in your word processor and print from there.