Windows Installer is suddenly missing and cannot be changed.

Without warning, the program seems to have disappeared and nothing seems to be done for re - install.
Try to install Windows Installer 4.5 results in a message that the update does not apply to my version of Windows.
I found this page:
Trying to make #1 (a registry repair) on the results page of support at the address above in the same error message (Setup is missing).
#2 seems to be a temporary solution.
#3 leads to search in the menu 'Services', where it is not in the list.
#4 regarding uninstall programs seems to be a solution, application by application, not something that looks like it will solve the underlying problem.
Any help would be greatly appreciated.  I need to get into Excel, and this error prevents me to do.  Thanks in advance.

Hello

Method 1: I suggest you try the steps from the following link:

Problems installing and uninstalling programs on Windows computers
http://support.Microsoft.com/kb/2438651#reso3

Method 2: Unsubscribe and re - register the Windows Installer to do this follow the steps below.

a. Click Start, click Run, type MSIEXEC /Unregister. and then click OK. Even if you
This correctly, it may seem that nothing is happening.
b. Click Start, click Run, type MSIEXEC/REGSERVER and then click OK. Even if you
This correctly, it may seem that nothing happens, or you can briefly see an hourglass.
After you run this command, the operation is complete.
c. try your application based on Windows Installer again.

Method 3: Try the SFC scan on the computer.

How to use the System File Checker tool to fix the system files missing or corrupted on Windows Vista or Windows 7
http://support.Microsoft.com/kb/929833

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