[George]

I just double checked and it works here on my 98SE.

I went in and checked the block, rebooted and the WMP came up automatically when I inserted a cd.

Went back in, unchecked the block, rebooted the pc and it is turned off. Nothing happens when I insert a cd.

Are you using 98 or 98SE?
Are you being prompted to reboot after you uncheck the block and exit? I don't remember if that prompt existed in 98. The change does not take place until you reboot.

Beyond that...I've no ideas.

George