• Do you remember making any changes to the computer recently?
This may happen if the Windows Installer files that are on your hard disk are damaged or are missing.
You install or remove a program that uses the Windows Installer Microsoft Software Installation (MSI) package file (.msi). For example, this may occur when you try to install Microsoft Office on your computer.
Method 1
First I would suggest that you check if the Windows installer service is running on the computer.
1. Go to "Start" - "Run" type "services.msc" and press on "Enter" button.
2. Double-click on the service named "Windows Installer"
3. Check the value in the "Startup type" field. If it's currently set to "Disabled", then this is the problem. Change it by selecting "Manual" from the drop-down box.
Make sure that the service is started and set to Manual.
Method 2
If the above step fails then 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
If the above steps fail then I would suggest that you install the latest version of Windows installer on the computer, refer the below link.
www.microsoft.com/downloads/details.aspx...4&displaylang=en 
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