Is the Vaio also running XP? If so, is it XP Home or XP Professional?

My recommendation Bill is to uninstall the USB Driver if you haven't already. Go to Yamaha's site to get info on how to uninstall the USB Driver correctly.

After you uninstall the USB Driver you should in my opinion go to the Windows Update site and see if there are any updates for your computer. The critical updates are the most important but using the "Custom" scan option you may find other enhancement updates available that possibly may correct the anomaly you are having with the Vaio computer not installing the Yamaha USB Drivers correctly.

After installing any updates you should "Defrag" the Vaio's Hard Drive and also check the Hard Disk for any errors.

Also there is a possibility you may have a Virus[s] on your computer that is affecting your computer adversely. Spyware can also have a tendency to affect normal operations of a computer. Microsoft Beta Anti-Spyware program is an excellent program to rid your computer of Spyware. Ad-Aware is good one too. Also make sure your Virus Scanner's .dat files are up to date and scan for viruses if need be.

Then to install the USB Driver again make sure you follow Yamaha's directions to a tee. I also would recommend you close each and every other program running on your computer i.e. those that are running in the System Tray and those running in the background also. Hitting Ctrl/Alt/Del on your computer keyboard will bring up the Windows Task Manager. Go to the "Processes" tab (Windows XP/2000) and 'End Task' on every process that is safe to do so. PS: You need to be careful you don't 'end task' on a process that Windows needs to operate. If you have doubts about one or more of them then don't disable it/them. When the programs are safely closed out then you can attempt to re-install the Yamaha USB Driver again. If the Vaio is running XP then you want to install the XP Driver. If you are running a different OS than XP on your Vaio you need to install the corresponding USB Driver, e.g. Windows 2000, ME, 98SE, etc.

Hope this helps...

Best regards,
Mike