Where did he get the Yamaha Vista Driver, as the only one I could find on the Yamaha site was for the 64bit version? (Or is he using the 64bit Vista OS)
Most music software is designed for the 32bit Windows platform and will not function correctly under the 64bit platform.
To try and diagnose any further I would need specific details of software/hardware used. (Including version numbers)

Bill
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English Riviera:
Live entertainment, Real Ale, Great Scenery, Great Beaches, why would anyone want to live anywhere else (I�m definitely staying put).