Intrusive ? I don't find it intrusive at all. But if the program detects something that might be wrong, you can get a prompt, for example, updating security certificates (Microsoft non-critical updates) caused the program to ask me if wanted to allow changes in security zones, or something like that. Depending on whatever you use, you may get some pop-ups, but if you choose 'allow' and 'remember' you should get the question only once. At some times, (like when you're installing windows updates, and you're sure it's the real thing) it's just better to temporarily deactivate the active protection. It has a whitelist, but it's not complete. I had to tell Counterspy that the software for my printer is ok ! If you don't forget to tick the 'remember' box, you'll get very few prompts after some time.