how bad is Windows XP?

Windows XP is one of things people work with it but there are many problems in it. Most of computers in the world use Windows XP and user usually are not interest about working with it.
The big problem is Register system in windows XP because you don’t know how control it and if you try to fix small problem you won’t do anything. For example when we try to find some information from Registry Editor you can’t do anything and you maybe will make new problem. Second problem is Run menu(Win key+R) there are many shortcuts ways to do interesting things but the problem is there is no any way to find some information about it, in fact Run menu is like command dos but who knows how work it? Just some big old specialist, But you can find some way to use it by practicing and trying a lot.
Next problem is security, Windows XP let virus to do every thing they can do and they want! (Do you remember Smss.exe?) For test it just go on the internet without firewall, your computer convert to old dog with many insects on it. If Windows is bad operator why people use it?
1. Work with Linux is difficult and you have to learn more things but Windows XP is easy to use 2. Windows XP is slow like snail but many useful programs work with it
3. Windows XP doesn’t have security but there are many Anti-viruses

But we have to change way from Windows XP to Linux if you don’t accept it you have to ask from specialist computer! I want to change it as soon as possible