Heres 2 quick HOW-TO's on how to play d2 without a cd and in windows mode!
PLAY IN WINDOWED MODE..
To play in widnowed mode is simple.. Just go to the shortcut/icon where you normally start DiabloII from, Right click it. Click Properties.. open the 'Shortcut' tab.. when there you will see a textbox labeled Target and it should be C:Program FilesDiablo IIDiablo II.exe' or something along the lines o this.. and alls you do is add a -w at the end of it. so the final product would be C:Program FilesDiablo IIDiablo II.exe' -w
ENJOY!!!!
PLAY WITHOUT CD
You must first have the Diablo 2 Lord of Destruction disk to do this...
Instructions!!
1: Insert the Diablo2 Lord of Destruction into your disk drive...
2: Go to My Computer
3: Open the Diablo 2 Lod Disk 'as in View the files on the disk'
4: Once inside you will need to copy 2 files 'D2XVideo.MPQ' and 'D2XMusic.MPQ'
5: Now navigate to your Diablo II folder.. Default is C:Program FilesDiablo II
6: Just paste them in..
7: Enjoy!!! you should now be able to play without a disk!!!
ALTERNATIVE
-If you have purchased the game and register the keys with your Battle.Net account you can download the game from the site.