if none of the above works just try to do a complete re-install. USUALLY (just typically) if a disk is damaged to the point of file corruption, it
wont continue with the installation.
There could've been a screw up during the intial installation.
Just use the add/remove programs feature and make sure Everything "diablo 2" is gone
try again
If that still doesnt work
you can buy D2 from wal-mart for like 9.99