In order to stop the program from loading on Startup run MSCONFIG if you have 98 or ME (I think XP has this, but not sure?) then click on the Startup tab and disable it.
Start / Run / MSCONFIG
Only thing I can think of is that the Real1 replaced the CDPlayer app?
Click on "My Computer" and select the View Menu and Folder Options. Click on the File Type tab and see what it says for the types of
"AudioCD" is it registered for. Change the default player from Real1, to
"C:\\WINDOWS\\cdplayer.exe /play" without the quotes. The old one may be there and you just have to set the old one to the default.
Please let me know if this helps.