Diablo 2 keeps not responding on windows 7?

I upgraded my Toshiba laptop from vista to windows 7 a few months ago. Later on I bought diablo 2 because I wanted to play it and I didn't own the game any more. I could never get the cd's to work properly so I ended up getting the digital download from Blizzard. Now the only way I can play Diablo 2 is by having the game in xp service pack 2 mode and by having it in window mode, but this only works some of the time. Playing in full screen doesn't work AT ALL. The rest of the time the program doesn't respond so then I have to restart my computer several times until it works. There has to be a better way.....any suggestions?

PS I have 32 bit computer if that makes a difference.