Mcapubhack problem!!! OMG

i keep getting this error when trying to run the hack: "Process is already running" , then also the hack doesnt even work when i login when im in the lobby. and when ever i try to delete the hack to redownload it an error comes up: "Cannot delete MCAPUBHACK.dll: Access is denied.
Make sure the disk is not full or write-protected and that the file is currently in use."

i dont know what to do i dont know how to delete or deactivate the hack some1 plz help me out ASAP! also those errors are without the quotes.

u on vista?
and once u inject first, you cant do again

and try it 2 times
usually works 2nd time