Assuming your Windows, you could run a system restore. That will remove the program. Then you could use a registry editor, I recommend ccleaner, to clear out any registry values it might have left behind.
If you cant system restore, check to see if it is still installed by clicking start > control panel > add/remove programs. If its still in there, try reinstalling and uninstall, like Brinks said. But most likely your problem is in your registry, so try ccleaner, I love it.
Here's a link if you wanna download it: