I wrote:
Download Tweak UI. Tweak UI can indeed turn off the autoplay.
All the best.

Well, Tweak UI turned off the autoplay alright but it also turned off the explorer. Now every time i start the explorer i recieve "Buffer overrun" message. I would have never used a 3d party product to tweak my XP, but this Tweak UI is made MS! Well i never...
Best wishes.