Hi there,

Well When you start up prey there is a program called securerom that looks for anything that is on its blacklist, including deamon tools. Even if you are using the original copy of prey this program will still look for any applications activated that are on its blacklist.
There is a LEGAL program that deactivates the blacklist called Curerom, which is free for download. you can download them from the below link -

http://download-free.programas-gratis.net/php/search.php?buscar=securom&viene=0

Good Luck!!

Thanks