You mean Premium Rate Dialers,right?!
Check C:\WINDOWS\Downloaded Program Files\ and rightclick those and look for the source-URL... you'll know when you recognize some URL's of billing-systems or some you have never heard of.
Thats where the actual active-x dialers sit.
If you have any Q's regarding a specific dialer,just ask.
I kinda seen them all
Take care,
JOKER