Just tried making SC-8820 work on my Windows 7 (home premium SP1) laptop. Downloaded Vista 64-bit driver from Roland. Extracted from zipfile, clicked on SETUP - said incompatible, so clicked on incompatibility troubleshooter and told it that it had worked on Vista - saved that and it installed fine. SC-8820 working fine. BIAB shows PARTA, PARTB, MIDI OUT as before with XP machine.

(Having said that I use Realtracks most of the time so this was just as a backup / to see if it worked. I use a Roland SD-50 now, which has the advantage of playing both the MIDI and the Audio files!)