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Problem installing .Net Framework 4.0 on Windows Vista

Hi,

I'm having problems installing the .Net Framework 4.0 Runtime on a Windows Vista machine. When I try to run the installer (I tried both the Web installer and the offline version) nothing happens. By taking a look at Task Manager a corresponding process keeps running indefinitely but no noticeable CPU activity ocurrs. I get no splash screen, no eula, no error popups. If the UAC is enabled the elevation popup takes place, though. I tried the usual steps: disabbling the UAC, disabbling and even removing the Anti-Virus. Also the where no noticeable events in Windows Events.
As an additional measure I  ran the Windows Update (the pc was on Service Pack 1) and applied all the pending updates (including Service Pack 2) to no avail.

Best Regards,
Filipe
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Randy Downs
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You might try runas administrator on Vista
Maybe this will help

http://www.microsoft.com/download/en/details.aspx?id=17851

Instructions

1.Important: Make sure that your computer has the latest Windows service pack and critical updates. To find security updates, visit Windows Update. If you are installing on XP 64 bit or Windows 2003 you might need to install the Windows Imaging Component. The Windows Imaging Component 32 bit can be found here . The Windows Imaging Component 64 bit can be found here .
2.On this page, locate the Download button and then click it to start the download.
3.To start the installation immediately, click Run.
4.To save the download to your computer so that you can install it later, click Save.
5.To cancel the installation, click Cancel.


Web Developers and Administrators

To install the .NET Framework on a Web server or to setup an entire Web development environment, use the Microsoft Web Platform Installer.
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FilipeMC

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I already tried both the web and the complete (offline) installer.
Might be something on this thread that will help like installing in Safe Mode or Clean Boot State.

http://answers.microsoft.com/en-us/windows/forum/windows_xp-windows_programs/net-framework-40-will-not-install/3969be80-3d34-477f-b942-b79cf56aacb0

Clean Boot state.

Putting your system in clean boot state helps in identifying if any third party applications or startup items are causing the issue. If yes, you may have to contact the program manufacturer for any updates or uninstall and re-install the program.

Follow the steps given in the link below to do the same:

How to configure Windows XP to start in a "clean boot" state

Note: After troubleshooting, make sure to put the computer to start as usual as mentioned here:

To configure Windows to use a Normal startup state

After you used the clean boot to resolve your problem, you can follow these steps to configure Windows XP to start normally.

 

 

a.    Click Start, and then click Run.

b.    Type msconfig, and then click  OK. The System Configuration Utility dialog box is displayed.

c.    Click the  General tab, click Normal Startup - load all device drivers and services, and then click OK.

d.    When you are prompted, click  Restart to restart the computer.

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Safe Mode:

a) Restart your computer and start pressing the F8 key on your keyboard. On a computer that is configured for booting to multiple operating systems, you can press the F8 key when the Boot Menu appears.
b) Select an option when the Windows Advanced Options menu appears, and then press ENTER.
c) When the Boot menu appears again, and the words "Safe Mode" appear in blue at the bottom, select the installation that you want to start, and then press ENTER.



I've seen this problem before, and doing the clean boot as Number-1 suggests is what I was going to advise as well.

I've seen even MS Windows setup sit in Task Manger for half an hour spinning its wheels with the symptoms you describe.  If the OS setup itself can't run, no other setup can be expected to either :o)  Clean boot is going to be the answer.  

Safe Mode isn't going to work because some necessary services wont be active (running).
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FilipeMC

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The pc owners  is pressing us for a definitive solution (they don't want more troubleshooting) so due to this factor we decided to do a full OS reinstall.