i had a similar problem recently with a dell laptop, and after arguing with a CS rep for ages, he finally gave me a solution (which may or may not help!).
try this Microsoft KB http://support.microsoft.com/kb/929461
Be careful because your playing around with the windows registry, but if you follow the exact instructions, you'll be just fine.
On the downside, you may have to re-install apps tht use the drive for functionality for those apps.
Hope that helps.