"A Required Privilege Is Not Held By The Client"

So, seeing this since yesterday in my home computer. The system is Windows 7 x64, ran the last monthly preview rollup update yesterday which might or might not be related to this. Securitywise, WSA and Zemana is installed.

When I try to install a new program or update, getting "A Required Privilege Is Not Held By The Client" error. But not always. I tried to install HMP.Alert and it was installed just fine and worked flawlessly. Ccleaner shows it required WinXP or later. FilemenuTools setup shows it cannot execute file in temp directory.

So far what I have tried.

1. Set the entire C drive permission to full for Admin account. Program files X86, ProgramData and Windows folder owner was set to TrustedInstaller earlier, set the owner for the C drive back to the only Admin account.
2. Enabled the built-in administrator account and tried to install from there but same errors from there too. Tried creating a new Admin account and same error there too.
3. UAC was disabled earlier, enabled, disabled and tried to see if that was of any effect. Nothing.
4. Right-click and "Run as Administrator".
5. Moved the setup files to the root C drive and tried to install from there.
6. From LSP Security options checked that "Admin approval mode" was disabled.
7. Changed the environment variables of temp folder to a new one and reverted back. Set the temp folder permissions to full and also checked by manually copying files there.
8. Disabled WSA and ZAM.

Obviously restarted after each change but so far nothing worked.

Anyone have ideas?

 

I'd just restore my latest working disk image... If you don't have that, I guess you could try this: http://www.tweaking.com/content/page/windows_repair_all_in_one.html

 

This may sound stupid but have you enabled Administrator account and logged in?

 

Only one account and thats Admin account. Created new account and tried that too. No luck.

Tweaking's AIO repair couldn't be used (required privilege error), either portable or installer, as usual. In safe mode, repaired everything, however still the same problem persists when I login back to normal Admin account. Under safe mode, I could install, update softwares as usual.

I don't have a recent image of this computer, so if nothing works will do a clean install later.

 

Before you do a clean install, use Recovery to return to the time before you installed any apps on Windows.

If that doesn't work, wipe the disk and do a clean install.