packard bells come with a tool to create master cds on first boot (my old machine did anyway).
maybe you can get a program that will make master cds now... though it might copy whatevers slowing your computer down and so reinstall it again, i dont know sorry. maybe someone else on forms can help ya out
if you dont get a program like that then i think your only option would be to clean install os again, which means you need a windows disk. if you weren't supplied with one when you bougth your computer (microsoft stopped giving them out with new computers) then you need to buy one... on oem its about £50, retail about £250.
to buy oem though you need to buy a piece of essential hardware like ram or a processor, motherboard something like that.
thats all expensive though, try gettin recovery cds, contact whoever you bought your computer from and ask them. or try searching for a program that will make you some
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