Windows 7: Need help on Windows 7 installing Warcraft. HELP PLEASE

I just bought a Windows 7 computer. But when I try to install the game, Warcraft III, it displayed a note, "Windows NT is NOT SUPPORTED for Warcraft III" under Install Warcraft 3. Apart from that, it also displayed another note, "Requires DirectX 8.0 or higher". As I know nothing much on computers, I seeked help here. Someone please help me! Thanks! And here are my computer infomation.

Windows edition:
Windows 7 Home Premium
Copyright © 2009 Microsoft Corporation. All rights reserved.

System:
Manufacturer: Hewlett-Packard Company
Model: CQ1-1011 D
Rating: 2.4
Processor: Intel(R) Atom(TM) CPU D410 @1.66GHz 1.66GHz
Installed memory(RAM): 1.00 GB
System type: 32-bit Operating System
Pen and Touch: No Pen and Touch Input is available for this Display

That's all.

setup.exe or something like that right click on it and select properties, then select the second tab "COMPATABILITY" run it in windows 98 / windows me mode. Hope that helps

1. Download and install DirectX End-User Runtimes. Some of the features are missing in DX11 from previous versions. This will install them.
2. Run installer in compatibility mode.

hope this will help

I tried and it succeeded! However, the game's graphic is quite laggy.. How?

first of all try graphics card driver update
hope it will help a bit, but in your graphics card is an integrated intel one, so don't hope too much... it is not because it's weak, but the compatibility is very low...
so if update won't help, I think there's nothing to do... :S

Okay.. I downloaded "Original Intel Graphics Driver" from Original Intel Graphics Driver Compaq Presario All-in-One CQ1-1011D Desktop PC - HP Customer Care (United States - English)
And I also installed and updated it.
So is it the right one?
Will it be better?

It will probably work the only way to find out is play the game.

I think it just got worse.
The animation during refresh alone is slower than the one before the update.
****!
Is there any way to return back to the original one before the update?

Do a system restore...

Sorry i was wrong. You could uninstall the driver but i do not know the implications of that.

Or you could try updating the driver again.

Foe both these methods all you need to go is to "device manager' (search it in the start menu) then locate your driver and right click to select up update ( i recommend you try updating before uninstalling) or uninstall.