"the windows installer service cannot be accessed .this can occur if the windows installer is not correctly installed contact your support personnel for assistance"

when i try o install any program using windows 7 installer the following msg appears "the windows installer service cannot be accessed .this can occur if the windows installer is not correctly installed contact your support personnel for assistance" 
what can i do to solve this problem
plzzzzzzzzz help me

Keys to the Problem "the windows installer service cannot be accessed .this can occur if the windows installer is not correctly installed contact your support personnel for assistance"

Hi,
 
Method 1:
You can run a system file checker scan.
Refer to the below link:
http://support.microsoft.com/kb/929833
Method 2:
Refer to the below link:
Error “The Windows Installer Service Could Not Be Accessed” when installing or updating programs on Windows 7 or Windows Vista
http://support.microsoft.com/kb/2642495
 
Hope it helps.

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