How to re install Snow Leopard with Mavericks running?

Hello,
Not long after it was introduced I upgraded my Macbookpro from Snow Leopard to Mavericks.
(Apart from that it also has a Bootcamp partition with MS Windows 7)
But Compared to any other Mac around me, mine has been extremely slow and the Mavericks upgrade did not solve that.
It has Microsoft Office for Mac and Mackeeper and I suspect either of those could have something to do with it.
To see if that helps I want to do a complete reinstall of the OS X.
I already made a full backup of both the Mac and the Bootcamp side.
But when I load the original Snow Leopard install DVD it says it can't do the install because it there is a later version (being Mavericks) running.
What should I do?
Thanks,
Sander

Thanks a lot for your quick responses.
I was able to do what Mende proposed and have also removed Mackeeper.
I don't know what the cause was but the Mac appears to be back to it's normal speed now.
However, stragely enough, when I start up using the option key to choose between the MacHD and Windows partition, I suddenly have three partitions to choose from.
Mac HD, Windows and a new one called Recovery which of course I would like to get rid of without damaging anything.
Do you know how to do that safely?
Thanks again

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Message was edited by: Julian Brown

Julian Brown wrote:
As a keen Mac-user (but by no means a technical expert) I would like my Snow Leopard experience to be as painless as possible, so how best to install it please and at the same time eliminate my old Leopard problems outlined above?
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