Well,i will tell you how to stop the hacker,when your computer got hacked.
If you are online or writing your passwords and you heard a sound from your pc like (tekk)
then there is a hacker on your laptop and you must do the following steps:
First of all Go Offline.
Now Put your important files on Flash or CD
Just Format your PC.
Setup the Windows and programmes again
5- install Strong Internet Security like Avast internet security.
After that if you heared the same sound again (tekk) , then the hacker is still on your pc and might be hacking on your motherboard, so you better get another pc to work on.