need help!:?

I am using nokia 3660
I installed some trial version of application few days ago and i tried to remove it just now
after i removed the applications.
i found that the ApplInst60 is missing too.
It no longer show up in the menu as it used to
I dun know if i do sth accidently to delete it or whatever happen
But i just can't get it to appear again
I need this app to help install my applications
Anyone have any idea how i get this ApplInst60 back on my phone?? :? :?