look through start menu/all programs and look for anything that says recovery, or similar, if you cant find anything, reboot then press F8 during bootup, to get boot menu, and look for recovery in there - chances are the laptop will have built in recovery that can format everything.
If not, then you can do a manual cleanup as said above - Run Ccleaner, go through control panel>add/remove prorgams and uninstall everything thats been installed ahead of the earliest date you can see in there.
Delete desktop, docs, etc, defrag, virus scan.
Or lastly, you can format and reload - my advise if you do that, is go to the manufacturers website and download ALL the drives and put them on pendrive first, makes it easier after fresh install.