Having touble with Windows Installer

Having trouble installing new programs on my laptop. Keep getting error messages like "iKernel.exe not found" or "Windows Installer Service cou;ld not be accessed. "
How can I fix this?
How can I fix this?
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Another thing, are you closing all background programs first? Try that, and make sure you temporarily disable any anti-virus program you have running. (Don't forget to turn it back on!)