please install diablo 2 before installing lord of destruction

And also I have a 128 Radeon 9000 Graphics Card. so you can check it out and tell me what you think and whether or not you can help me with this problem. But I have taken a screen shot of allot of my computer info and stuff in one. So I thought ('Hey why would it ask me for my play disc cd twice?'). Then I opened my CD drive and there it is.

So I looked at my other Diablo 2 Regular CD's and they weren't 'Play Disc'. Now here is where I got a little confused and weirded out. 'Please insert the Diablo 2 CD labelled 'Play Disc''. And after about 2 minuets or less I could hear my CD Drive slow down and the little light on it would blink allot and then it said again. Then afterwords it said 'Please insert the Diablo 2 CD labelled 'Play Disc'', So I did. So I put in my Diablo 2 : LoD CD and it said 'Upgrade to Diablo II : Lord of Destruction (800 MB)' And I clicked it and put in my CD key for LoD. So then I got off Diablo 2 regular and then I wanted to install the Expansion (Lord of Destruction = LoD). And after installing it I opened the game and got all of the updates to version 1.12 I think it was. So I went to my computer and successfully installed Diablo 2 Regular (Full Install) with the 3 CDs that came with the box (Install Disc, Play Disc and Cinematic's Disc). So what I did is I went into my closet and dusted off the old game and started to install it on my computer (I have the Diablo 2 Regular and Diablo 2 : Lord of Destruction genuine cd's and CD-Keys, no copies or cracks here). The recent Diablo 3 announcement got me really into Diablo 2 again.

Please install diablo 2 before installing lord of destruction