How to get unwanted programs off my computer?

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I have tried to uninstall both K-a-z-a-a (filter wont let me type the name) and Pacific Poker off my computer for ages. I've obviously tried using the Add or remove programs,but always got an error message when trying to remove these two. Any one know what to do?

p.s. I dont mind Pacific poker so much because it is not that big of a file, but K-a-z-a-a is a huge file and I imagine it slows up my computer.