JRE 8u74 fails to install on Windows Vista SP2 (X64) system with error 1603.

Steps to Reproduce:
How to reproduce:
1. Launch JRE executable, 32-bit or 64-bit executables (offline or online) on a Windows Vista SP2 (64-bit).
Note: This system does not have any default JRE installed.

2. UAC dialog will appear seeking permission to continue with installation. Click "Continue".
3. Wait for few seconds and the Java Setup - Welcome window will appear. Click on "Install" button.
4. Java Setup - Progress window will appear displaying Status: Installing Java. The dialog will disappear suddenly. Wait for few seconds and a Java Setup - Incomplete dialog displaying message - Java update did not complete with "Error Code: 1603" will pop up.
Click on Close. (Log files can be availed from: Start > Computer > c: > users > username > AppData > Local > Temp). jusched.log and JavaDeployReg.log files.
5. To resolve this issue temporarily, launch Java Control Panel from:
C:\Program Files (x86)\Java\jre1.8.0_74\bin\javacpl.exe

6. This action will launch Java Control Panel. Click on Security tab and uncheck option -> "Enable Java content in the browser". Click "Apply". A UAC dialog seeking permission to continue will appear. Clicking "Continue" will pop up Success - Java Plug-in dialog with message "Java Plug-in settings changed. Click OK - Ok.

7. Now repeat the steps 1-3. This will installation will complete successfully. You may receive Java Setup - Uninstall out of date versions dialog. Choose appropriate action from "Remind Me Later or Uninstall". This will be followed by "Java content is disabled in web browsers" dialog box with instructions to how to enable the Java content in web browser. Click Next and Close.

8. Now to enable Java in browser, launch Java Control Panel from Start Search or C:\Program Files (x86)\Java\jre1.8.0_74\bin\javacpl.exe

9. Go to "Security" tab and check the first option -> "Enable Java content in the browser". Click Apply - Continue (UAC permission dialog) and Ok to complete the action.

10. Verify applet - https://www.java.com/en/download/installed.jsp will confirm the installed version.

However, any subsequent or future JRE installation will fail with error 1603 again, unless you uncheck the "Enable Java content in the browser".

Attached - screenshot displaying "Java Setup - Incomplete" with Error code 1603

- JavaDeployReg.log and jusched.log files.

This issue is consistently reproducible. Access to system is available upon request.