How to remove express zip files?

hey guys can you help me how to remove the wavepadand NCH software.. it make my laptop missed up..i dont know what to do.. i alrady want to remove it all 

i downloaded a sound file converter from nch software and ... express zip upon installing wavepad sound editor. i removed the wavepad program and the express zip ...  

... a customized uninstaller which removes additional junk content when you ... going into the Add & Remove Programs and pressing **Windows ... complete cleaning of the junk files left by the application. ...