The product key is on a label under the battery (assuming it shipped from Dell with Windows 7).

The reinstall procedure is here:

https://www.dell.com/support/kbdoc/en-us/000125616/restore-factory-reset-or-reinstall-windows-7-on-your-dell-computer

Note:  Windows 7 went end of life in January, 2020 -- no further security updates since that time.  It's a risky OS to use online at this point; Windows 10 is a better idea.

Welcome to the Dell Community @Kyleboy21 

My suggestion would be to download and install W10.

https://www.microsoft.com/en-us/software-download/windows10

Your COA should be under the battery and it can still be used to activate W10. "Tested last week."

I have an E6410 as my backup laptop should my HP fail!!!

W10 installed with no problems.

Best regards,

U2

But what about the drivers that came with Latitude e6410? Will they work?

@Kyleboy21 

Sorry for the delay.

I had not turned it on for sometime and it was doing updates W10 [20H2]

All devices have drivers.

Most W10 drivers will install automatically.

If not you may need to use some W7 drivers from your Driver Support page.

https://www.dell.com/support/home/en-us/product-support/product/latitude-e6410/drivers

One W7 driver you will need.

ST Microelectronics Free Fall Sensor Driver:

https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=f91kt&oscode=w764&productcode=latitude-e6410

Best regards,

U2

Most of the drivers will be found in Windows 10.

If they are not, just connect to your router via Ethernet cable and the drivers will download.