How to full uninstall shareware program?

i had download a shareware program. and found crack serial No from net. the program work fine. but i decide to buy online. But how to fully uninstall the program? because it keep remember the hacked serial no.

 

naughtyboy, you have been very naughty indeed.

Just try Control Panel->Add/Remove Programs, when logged in as Administrator. You would see a list of programs, installed on your computer. Select the shareware program from there & click Remove.

Or you can see if there is some shortcut called 'Uninstall' or 'Remove' or something like this in the Programs menu.

 

i don't think it will install full using this simple step.
any 3rd party software to remove it?