Question: I want to learn how can I protect my PC from getting hacked in order to protect myself from cyberbullying. There is an intruder who has hacked my system over the last 4 years. 

He has hacked my all emails, websites I log on to and whatever when it is related to me being online. He has a team of friends and has professional links all over the world. 

When I make an email from another computer, I don't know how he comes to know about it but he knows my minute credentials of my account information. 

When I go on certain websites my internet suddenly disconnects. I have to connect and reconnect my modem at least 200 times a day.

Even if I choose to take legal action on him,he would be locked up for some 6 months in a prison,but I have other plans for him(sorry for openly threatening). 

I haven't used any of my emails (except reading) from last 3 years,he knows every website I visit on and that is how he uses me.

And I know all this, because he has accepted all these things over our chat.

Someone has advised me that I will have to become hacker to prevent myself. Is there any way I can consult a good security expert or an institution,where would I find it.

I live in India.

Answer: 
1. format your system
2. get an Antivirus and Firewall
3. secure all your wifi networks
4. make a new email address or change EVERY detail in your email account especially password and security questions. Your password needs to be strong.
5. file a complaint with your local police office
6. Don't share any details with anyone.
7. stop doing drugs.
Something that you might consider is that a person (for all intents and purposes) really only needs to be able to access your email in order to be able to access virtually everything else that you are registered with. This is especially the case if you have only one email address for everything. 

Also, some email providers (I know Yahoo, for sure was this way in the past and probably still is) get "hacked" constantly. There is really no hacking involved in the sense you are familiar with. The security measures to reset the email password involve using some handy security question that is supposed to be personal. With as much information as people post around the internet nowadays, you can find the answers to most peoples' security questions without much effort. So every time you change the password, they simply use the reset tool and change it right back to whatever they like. 

You should really secure your wireless network though (you can google it by the make and model of your router, if you are able to find that)