How can a user prevent specific applications from accessing a Windows computer over a network?

We can prevent specific applications to be accessed over a network via a Firewall which is a default feature of the windows.

Explanation:

Firewall will block the application to be accessed by the internet and it will protect the system from the malware.

Usually, when we want to avoid adding to our system from any specific application, we can use a firewall.

We can use a firewall for an unauthorized users to access the private network. It can be in hardware form and software form or we can use a combination of hardware and software both.