Cannot install *.msi files

Hi, i've got Windows 8 installed on my laptop.

I tried to install a *.msi file yesterday and my computer tried to open it with "free zip viewer" instead of installing it.
So i tried to open the .msi file with msiexec.exe using the "open with..."command but I got a message error
(i'm translating it from italian, so words may not be the same)
"it's impossible to associate the selected program to this kind of file. Select another program"

It acts like this with every .msi file.

What can i do?

Thank you in advance for your support

There are a number of ways to open an .msi file here---

https://www.google.com/search?client=opera&q=how+to+open+.msi+file&sourceid=opera&ie=UTF-8&oe=UTF-8

This may help too---

Download Windows Installer 4.5 Redistributable from Official Microsoft Download Center

David Bailey said:

This may help too---

Download Windows Installer 4.5 Redistributable from Official Microsoft Download Center

Click to expand...

thank you for your answer.
I tried to install Windows installer (Windows 6.0 version,I hope is the correct one...) but it gives me this error:
0x80096002 "The certificate for the signer of the message is invalid or not found".
Do you think some system file is corrupted?

Something is wrong.

I never had any trouble with .msi files.

Maybe running, in administrator cmd prompts---

Dism /Online /Cleanup-Image /RestoreHealth

&


sfc /scannow

would help.

I found this too---

(Solved) Microsoft windows installer error MSI Repair Tool (Freeware)Tech Support All