Is an absolutely secure system?

Is an absolutely secure system available? (switch) -- Linux general technology-Linux technology and application information. The following is a detailed description. A few days ago, I saw a German news saying: "allow countries to search for personal computers over the Internet. I suddenly thought that our system is very dangerous, with a lot of problems. In fact, our computer security is extremely low. As long as hackers want to know what we are doing, they can know what we are doing? What are you looking? Search for what? What is written in the diary?

What do you say if you have a camera or a microphone? What? All are at a glance. As long as someone thinks, As long as someone wants: he can see you, what you say, how your business is, whether there are "Photos", how many bank cards are, what birds are taobao online, and what are said in QQ chat. There are not many confidential things, but I don't want to be transparent (maybe someone wants ). I have fingerprint recognition in my book, and I have also bought genuine Anti-Virus products, but all of this seems to be insignificant. All security measures are useless, because someone can search your personal computer on the Internet at any time, just like a robber.

How can I be more secure?

Ps: Some people say that vista is not safe. I switched to xp. Some people say that xp is not safe. I switched to ubuntu. Some people say that ubuntu is not safe. I switched to gos and later found that it is the same as ubuntu. If not, I will change to dos.