You can try going into, Computer,Double click C drive then program files and see if it is there. If so delete it.
I had a program just like you discibed that wasn't in the Programs and Features, but I found it in program files and deleted it there.
I am trying to remove a logitech webcam version from my system to upgrade. However, I cannot see the pgm in the control panel to uninstall. Any ideas. I am having a similar situation with my Palm PDA. I can see all other programs except these two
I am running Vista Home premium edition.