How to Fix Windows Installer Problem
“The Windows Installer service could not be accessed. This can occur if you are running Windows in safe mode, or if the Windows Installer is not correctly installed. Contact your support personnel for assistance.” The ms website knowledge article 324516 gives 2 methods as a way of fixing this problem, but if anyone can solve this this problem without see that then i think he or she is a lucky one! However, this problem you can face for different sort of reason but if you can fix that problem then you can easily solve that. ok, let’s see how can you solve this problem
>right click your root windows installation drive i.e drive where you installed windows
> click properties at the bottom
> select security tab
> click Add and scroll down to SYSTEM account click add and click OK.
>allow Full control permission and click Apply and then OK.
This should solve your problem with windows installer.