Help! Windows says “This app has been blocked for security reasons”: What should I do? (Q&A)

Does the Windows message “This app has been blocked for your protection” appear? Don’t worry—this often happens when a program is outdated, unsigned, comes from an unknown publisher, was downloaded from the internet, or requires system changes. This doesn’t automatically mean the software is harmful. However, only trust programs from reputable sources—and if in doubt, it’s better not to open them. This way, you’ll stay on the safe side.

2 Min. reading time

05 June 2026

Help! Windows says “This app has been blocked for security reasons”: What should I do? (Q&A)

Question: I was trying to install a program. Suddenly, this Windows message appeared: “This app has been blocked for security reasons.”

The program was installed on my old computer, and I wanted to transfer it to my new computer. Is the program dangerous or not?

Helmut R.

Answer: Many Windows users are initially startled when a window suddenly pops up with the message: ” This app has been blocked by
for security reasons.“

At first glance, this sounds alarming, ...