cracking diablo 2

[almightyanus]

i've downloaded the cracks for diablo II, but when i try to copy the "d2music.mpq" file from my playdisk to my game directory, the file transfer goes just fine till the file's almost 1/2 done, then i get an error message saying that windows can't read from the specified device - and then the autorun from the playdisk goes off! is this a normal problem, or is my playdisk just wierd?
oh, i have the american version, if that makes any difference...