I have a similar problem - my autoplay function is not working (on CD-RW and DVD). In fact, it is not even an option - the autoplay tab is gone!! I have tried deleting/reinstalling the drives in Device Manager, I have tried to update the drivers, and I have tried the things referenced in the M$ Knowledge Base article mentioned above. Everything is set correctly. The other thing is that in Windows Explorer, my drives used to show the specific name (Toshiba DVD, Generic CRD-1700BP), now it just says CD Drive d: and CD Drive e:.
Any Other Ideas?!?
IWill XP-333 / 384MB PC2100 DDR / AMD T-Bird 1.33GHz (o/c to 1.40 until I get a better CPU cooler!) / VisionTek GeForce4 MX440 / SB Live! X-Gamer 5.1 / Maxtor 20GB 7200 RPM HD / Toshiba 8X DVD / Sanyo 40/12/40X CD-RW / Win XP Home