Its really your only option if your .exe is gone.

Why can't you reinstall?
And to double check, you went through add/remove programs and it wouldn't uninstall it for you?

dont work.. for that i cant uninstall

You aren't really explaining anything, all it says is that the game might be uninstalled already?
Then why won't it let you install it?

We might help u better when u explain it to us more detailed in a logical order - else we can just speculate

i cant open d2

it says

C:\Program Files\Diablo II\Diablo II.exe
not found the specified process

So i tryed to uninstall and said the same now i reinstalling and no problem for the moment lets wait until i open it