how do I instantly repair Windows Installer Service?

Troubleshoot Windows Installer

2438651 How to troubleshoot problems that may occur when you install, uninstall, or upgrade a program on a Windows-based computer

http://support.microsoft.com/kb/2438651

Unregister Windows Installer, and then reregister Windows Installer. To do this, follow these steps:

1. On the "Start" menu, click "Run:.

2. In the "Open" box, type "msiexec /unreg", and then press ENTER.

3. On the "Start" menu, click "Run".

4. In the "Open" box, type "msiexec /regserver", and then press ENTER.

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Try to ensure that Windows Installer service is running, or force start it.

1.. Open Run, and type in services.msc then press Enter. Alternatively, go
to Control Panel -> Administrator Tools -> Services.

2.. Locate Windows Installer in the all install services listing.

3.. Verify that the Status is Started. If the Status column is blank,
right click on Windows Installer and select Start.

4.. If you get error trying to force start the Windows Installer service,
try to change the Startup Type to Automatic (default is Manual), and then
restart the computer.
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How do I manually repair this..

Repair Options
 /f[p|e|c|m|s|o|d|a|u|v] <Product.msi | ProductCode>
  Repairs a product
  p - only if file is missing
  o - if file is missing or an older version is installed (default)
  e - if file is missing or an equal or older version is installed
  d - if file is missing or a different version is installed
  c - if file is missing or checksum does not match the calculated value
  a - forces all files to be reinstalled
  u - all required user-specific registry entries (default)
  m - all required computer-specific registry entries (default)
  s - all existing shortcuts (default)
  v - runs from source and recaches local package