Hello,
Have you checked the Remove Programs list to make sure that the Screen Saver isnt listed? Did you use that to remove the progam? Did it come with its own uninstaller? If it is still in the list, that means that the .scr program is still listed in the C:\Windows\system32 folder where the screen savers are stored. If you know the exact name of the one your trying to remove you can find it in that folder and delete it manually.
*Note* Any modification or removal of file(s) in this folder can be detrimental to your system. Do not modify or remove any files you are not 100% sure about.
Regards,
Alex T.
~Windows Desktop Experience MVP 2007-2011~