What kind of computers are we talking about? You mean, "Can I use my laptop to mine?”
My answer is technically yes, but, to be honest I don’t want you to burn your laptop out !
That being said, maybe you have a computer that is laying around not doing anything, or an office computer, a gaming computer… You could put it to work when you aren’t using it. While you are sleeping you can make some cold hard cash!
If you don’t have one kicking around, I would recommend buying a cheap tower computer from a government surplus store, a pawn shop or even a friend. Or maybe you have a computer that is just laying around that is not being used. One of my friends got a whole computer for only 250 dollars! I know, right? Not too expensive… You just have to make sure that you have a video card that has at least 1 gb of GDDR5 memory and a motherboard with 1x PCIe x16 slot ( either x16,x8 or x4).