how much will it cost to have my com cleaned , because of hackers

Not sure but if you call best buy they can assist you

I'm not sure, but if you contact their Geek Squad they can give you a solid estimate.

If hackers have attacked your computer, then having your computer cleaned is the least of your worries. Step one, change every password to every account you have. Especially banking accounts. Do not repeat any of the passwords across any of your accounts. What leads you to believe your computer has been hacked? As a side note, I have used Best Buy Geek Squad previously for audio / video installation and I also recommend them. Also, you may want to consider a subscription to Norton 360.