running programs after installed??

[aakbar]

Hello,
I've been having a problem recently launching programs after they have been downloaded. I'll double click and it won't launch, i'll drag it to the desktop and they don't work. If i choose open with option the only one that works is word, and obviously it just shows all the computer language etc. I've tried to unzip them by dragging it into stuffit expander, it doesn't work. But the wierd thing is that if i try and erase them from the limewire library it says it can't because it's running somewhere. anway, please help....

thanks
aa