Do i need any of the operating system disks if I clean install?

My MAcbook pro is getting serously slow esp on the internet. So from what I understand the best method is a clean install.
However I do not have any of the previous operating system disks like Snow leopard and Lion. I am currently using Mavericks.
My worry is that the computer will go back to it's original operating system (i think Tiger), and I will not be able to update to MAvericks because I don't have any of the operatings disks before that.
Or maybe I don't need them? I have backed up everytjing on my computer and used time machine as a back up.
Thanks in advance,
L

Did you do an Over the Top install? That is where you reinstall right over OS X that is already on your system.
If you did and it ran fine for a day or so I suspect you are having some hard drive troubles. With an over the top install that replaces system files, OS X files, and makes them fresh. But if after a short while the system starts to run poorly again that comes from some corruption of those files. That only happens when there is drive problems.
If after doing a real clean install, first erasing everything off your system with Disk Utility, you still are having slow downs first thing I'd do is check out the drive for errors and personally I'd replace the drive.
KObryher wrote:
Hi,
I did reinstalled the computer yesterday. It seemed to work fine, and a lot faster. Unfortunately today it is back to a slow pace again. I will try the next step to clean install.
Thank youlowluster for your advice too. Very helpful. I will let you know how it goes...

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