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You should be able to download Windows 7 from Microsoft and use the Windows 7 key provided by the laptop manufacturer. Or you could also download Windows 10 and do a complete reinstall to see if it helps the sluggishness (you shouldn't need a key for this).

Hang on, do you have a full version of Windows 7 that you bought separately or did it come from the manufacturer? If you have the windows disc and OEM key from the manufacturer you will be able to boot from CD and reinstall windows 7 this would mean deleting everything on your main drive...

Have you got a recovery partition on your drive you can install from? Otherwise I think you are shit out of luck, how old is the laptop, can you send it back to the shop and ask them to put it back to factory settings?