If you have 64 bit windows this is what I do.
It can be a bit complicated so even though I've done many updates I do this one step at a time.
To install Camera Raw 5.6 manually on a 64-bit edition of Windows:
1. Close all Adobe applications.
2. Download Camera Raw 5.6 from
www.adobe.com/support/downloads/detail.jsp?ftpID=4624.
3. Extract the Camera Raw.8bi file from the ZIP file you downloaded. (In this step, extract only the Camera Raw.8bi file that is at the top level of the ZIP file.
In Step 5, you will extract the Camera Raw.8bi file that is inside the Win64 folder.)
4. Move Camera Raw.8bi into C:\Program Files (x86)\Common Files\Adobe\Plug-Ins\CS4\File Formats.
If you are prompted to overwrite the existing plug-in file, then click Yes or Overwrite.
5. Extract the Camera Raw.8bi file from the Win64 folder that is inside the ZIP file you downloaded.
This Camera Raw.8bi file is the 64-bit Camera Raw plug-in for Photoshop CS4.
6. Move the 64-bit Camera Raw.8bi file into C:\Program Files\Common Files\Adobe\Plug-Ins\CS4\File Formats.
If you are prompted to overwrite the existing plug-in file, then click Yes or Overwrite.
7. To install Camera Profiles, extract the CameraProfiles.exe file from the ZIP file that you downloaded.
Next, double-click on CameraProfiles.exe and then follow the on-screen instructions.