My Windows Installer doesn’t work

msiexpert created the topic: My Windows Installer doesn’t work
The last Microsoft update somehow screwed up my computer. Now I can’t install any software. I get the message, “The Window Installer Service could not be accessed”. How can I repair or re-install the Windows Installer?

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h30434.www3.hp.com/t5/Operating-systems-…sn-t-work/m-p/240270