Possibility – Check in C:\Windows\inf directory for the file branches.inf.
Right click the file, check properties, and make sure that the read only box is not
checked.
Note that the inf folder is hidden and is directly under the Windows folder.
Quickest way to open is:
From Start/Run, type in the following exact text:
%windir%\inf
Then Press OK, and the folder will open.
Other reference
http://support.microsoft.com/default...b;en-us;822798
You Cannot Install Some Updates or Programs “Digital Signature not found”
When you use the Windows Update Web site to install updates, the installation fails
and the
"humanj" <> wrote in message
news:86DB49F0-158E-40C7-BD16-...
> windows update upgrades downloaded but unable to install.
> tried automatick updates manual updates but the updates will not install on
> my system