The Windows installer may be corrupt - try the following procedure to check the Windows installation and fix any issues - note this may take a while to run:-
Click the Start button
Type: CMD the option cmd.exe should appear - right click it
Select 'Run as Administrator' - this will open a command window
At the Command Prompt, type: sfc/scannow and press Enter
Once the scan is complete if you have any error messages restart the computer and repeat steps 1 - 4 again.
You may still get an error message after the second scan - if this does happen, there may be a non-essential file that cannot be fixed.