The driver page for your system is as follows. There are a number of drivers available. If you go to the Dell support page and type in your service tag number, the correct drivers will be displayed.

https://www.dell.com/support/home/us/en/04/?~ck=mn

Also for a list of all the drivers.

https://www.dell.com/support/home/us/en/04/product-support/product/inspiron-1520/drivers