Problem running Unity 4.0.1f12 in Windows 8, help anyone?

Hello fellow developers. On the past week I've been wanting to install Unity on my Windows 8 partition so I can do some things just for fun. This task has been greatly interrupted due to the fact that whenever I attempt to run Unity, the following error pops up:

"D3D9 Debug Runtime is not supported: You are using Direct3D Debug Runtime, this is not supported by Unity. Switch to Retail runtime in DirectX Control Panel."

Upon seeing this error I promptly go to the DirectX Control Panel and 2 things happen:

1. Most of the options are disabled, that is, I cannot access to them in any way.

2. The "Use Retail Version of Direct 3D 9" is selected.

Checking dxdiag command on the prompt gives me the following information:

     ------------------
     System Information
     ------------------
     Time of this report: 2/26/2013, 11:59:43
            Machine name: MIGUELANGEL-PC
        Operating System: Debug Windows 8 Pro 64-bit (6.2, Build 9200) (9200.win8_rtm.120725-1247)
                Language: English (Regional Setting: English)
     System Manufacturer: Dell Inc.
            System Model: Inspiron N5050
                    BIOS: BIOS Date: 08/03/12 11:29:22 Ver: 04.06.04
               Processor: Intel(R) Core(TM) i3-2350M CPU @ 2.30GHz (4 CPUs), ~2.3GHz
                  Memory: 4096MB RAM
     Available OS Memory: 4004MB RAM
               Page File: 3255MB used, 4845MB available
             Windows Dir: C:\WINDOWS
         DirectX Version: DirectX 11
     DX Setup Parameters: Not found
        User DPI Setting: Using System DPI
      System DPI Setting: 96 DPI (100 percent)
         DWM DPI Scaling: Disabled
          DxDiag Version: 6.02.9200.16384 64bit Unicode
     
     ------------
     DxDiag Notes
     ------------
           Display Tab 1: No problems found.
             Sound Tab 1: No problems found.
               Input Tab: No problems found.
     
     --------------------
     DirectX Debug Levels
     --------------------
     Direct3D:    0/4 (retail)
     DirectDraw:  0/4 (debug)
     DirectInput: 0/5 (retail)
     DirectMusic: 0/5 (retail)
     DirectPlay:  0/9 (retail)
     DirectSound: 0/5 (debug)
     DirectShow:  0/6 (debug)
     
     ---------------
     Display Devices
     ---------------
               Card name: Intel(R) HD Graphics 3000
            Manufacturer: Intel Corporation
               Chip type: Intel(R) HD Graphics Family
                DAC type: Internal
             Device Type: Full Device
              Device Key: Enum\PCI\VEN_8086&DEV_0116&SUBSYS_05041028&REV_09
          Display Memory: 1664 MB
     Dedicated Memory: 32 MB
     Shared Memory: 1632 MB
     Current Mode: 1366 x 768 (32 bit) (40Hz)
     
        *Whole bunch of information that will be cut for readability and briefness, 
 will post if it's relevant to the topic in question*
     
     D3D9 Overlay: Supported
     DXVA-HD: Supported
     DDraw Status: Enabled
     D3D Status: Enabled
     AGP Status: Enabled

The current solutions I've tried so far have been re-installing the latest C++ redistributables, updating the Microsoft SDK, as well as installing the DirectX SDK and the latest version of its runtime.

Right now I know nothing else to do, so every comment is appreciated. Thank you in advance.