how can i know that my computer is haked is that possible to hack any computer tell me how to prevent it

Why do you think that your computer is hacked? (just so we know what is going on)

i think my computer is hacked because my cursor is sometime it wont work and some time when i move to the place it will dragdown itself to down on the taskbar my mother watch all the tv serials online thats why i think tell me how to prevent it:)

Do you have anti-virus and anti-spyware software? A firewall? How do you connect to the Internet.

BTW, its unlikely you have been hacked.

how can i know that my computer is haked is that possible to hack any computer tell me how to prevent it
disable file sharing in network connection property install any internet security software i.e (norton )