Problem unistalling application not listed in Remove Program list

Hello everybody, i really need help on a problem that was caused by me when accidentally set nouninstall property of .cab installer in a .Net CF application that i made. After the client installed the application he cannot unistall the application anymore! I'm already tried to erase the folders and the register key but always when i try install again the application it tells me that cannot unistall the previous version and the new installation is always failed. Even i did the correct configuration in the nouninstal property of the CAB installer, after installing the new version the application doens't apperar in the Remove Program list.

I really need some help in how do i remove any reference of the application to install again the new version with nounistall set to false (and the application appearing in the Remove Program list).

Thanks in advance