Dell Inspiron 558 Multi Touch Drivers for touchpad

I had recently upgraded my year old Inspiron 5558 to windows 10, but there arose some serious performance issues because of which I had to resinstall windows 8.1,but i lost the multi touch functions on my trackpad , as I have lost  the respective drivers.Any help with this issue is hugely appreciated.

PS- My PC is now running windows 8.1

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