Extra info:
My laptop runs windows 7.
According to the installer/help message, diablo 2 has a known compatibility issue with windows 7 but there aren't any online fixes.
I've gotten it to run exactly one time for 30 minutes before all this stuff started happening.
Sometimes when installing the expansion it'll hit an endless loop of "Insert play disc" "Insert Install Disc"
Think that's it. Any questions I'll answer whenever I get back.