[directx] DirectX SDK (June 2010) Installation Problems: Error Code S1023

After uninstalling too much on my Win7-64bit machine I was stuck here too. I didn't want to reinstall the OS and none of the tricks worked expect for this registry hack below. Most of this trick I found in an old pchelpforum port but I had to adapt it to my 64-bit installation:

(For a 32-bit repair, probably skip the Wow6432Node path)

1. Start regedit
2. Go to HKEY_LOCAL_MACHINE-> SOFTWARE-> Wow6432Node-> Microsoft->DirectX
3. If this DirectX folder doesn't exist, create it.
4. If already here, make sure it's empty.

5. Now right click in the empty window on the right and add this data (there will probably be at least a Default string value located here, just leave it):

   New->Binary Value
   Name: InstalledVersion
   Type: REG_BINARY
   Data: 00 00 00 09 00 00 00 00
   
   New->DWORD (32-bit) Value
   Name: InstallMDX
   Type: REG_DWORD
   Data: 0x00000001
   
   New->String Value
   Name: SDKVersion
   Type: REG_SZ
   Data: 9.26.1590.0
   
   New->String Value
   Name: Version
   Type: REG_SZ
   Data: 4.09.00.0904
   

6. Reinstall using latest DXSDK installer. Runtime only option may work too but I didn't test it.

7. Profit!