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 Files\Diablo II\Diablo 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 Files\Diablo II\Diablo 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 Files\Diablo 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..