Windows 7: Can't maximize window in Diablo II?

Hi,
I just bought a new computer two weeks ago and it has Windows 7 (64bit). I installed successfully the game Diablo II. At first, when I was starting the game, there was a color problem so I've been told to put to word: -window in the target (at the end) by right clicking on the diablo icon - properties. It actually resolve the issue but now, when I double click on the diablo icon, the game starts but with a small window so I am wondering why I can't maximize the window? Does anybody have a solution on how to maximize the window? I know windows 7 has some compatibility issues with games but it should work. I tried everything.
Thanks,
Yannik

My Computer Specs:

Windows Version:
Windows 7 Home Premium
System type:
64-Bit Operating system
Processor version:
Intel ® Core (TM) i7 CPU 930 @ 2.80GHz 2.79GHz
Installed Memory (RAM):
6GB
Hard Drive Capacity:
1Tb
Video Card:
Graphics card manufacturer: ATI
Graphics Chipset: Radeon HD 5700 Series
Dedicated graphics memory: 1024 MB
Sound Card:
Manufacturer: Creative Sb-X-Fi
Version 1.10.13
DirectX Version: 10.0
Motherboard:
Manufacturer: Gigabyte
Model type: X58A-UD3R

Some other fixes here: Battle.net - English Forums -> Windows Vista/7 and Diablo II

You are running it in windowed mode.... The best you can do is to set the resolution to the next biggest that is under your monitor res.

~Lordbob

Remove that switch from the shortcut, then: Browse to the start menu folder for DII, go to 'Video test', let it run the test, then make sure you select Direct3D, aka Hardware Rendering. Vista/7 cannot run the game using Software Rendering. There are many problems you can run into.

It's possible this isn't the cause, although it's the number one problem I know of with DII on Vista/7.

Thanks, I did tried that earlier but unfortunatly it didn't work. I also download GLIDE3-to-OpenGL-Wrapper Version 1.4d, it was supposed to be a solution but it didn't work either.

It's bizarre because at first it was only a graphic problem (green neon color) and by changing the mode to windowed: (apply -window in shortcut) it work but the only issue now is that I can't maximize the window.

I honestly have ran out of ideas!