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I have Firefox on my hp laptop and it has completely disappeared today.

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The message on my laptop says" tThis app can't run on your PC. To find a version for your PC check with the software privider."

The message on my laptop says" tThis app can't run on your PC. To find a version for your PC check with the software privider."

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That's strange. Maybe you should re-run the installer. Please scroll down to your preferred language:

https://www.mozilla.org/firefox/all/

The installer should detect your existing Firefox data and load that when it starts. If it will start!