External drive losing sharing settings on reboot

I have two external drives that I'd like to share. I have them mapped as an X: and Y: drive.

I go into advanced sharing settings > permissions, and add Full Control for the group "Everyone".

I hit apply and it looks fine and dandy.

When I reboot my machine the sharing settings are lost.

When the computer initially starts up Auto Play opens for both drives. Not sure if this has anything to do with it though.

Any ideas on how to get my sharing settings to stick for both externals?

Have a look here.
Antivirus software may cause Event ID 2011

and if that doesn't help you can try manually altering the registry to be persistent through reboots.
Same problem, but solved after below registry value change - CNET Computer help Forums

It seems like those people were having a problem with general connectivity and not losing the sharing permissions upon a reboot. Is this still worth trying?

I have no problem accessing the external from another computer. It's just that every time I reboot my computer, I have to re-share the external drive.

Well the real thing here is windows is always going to see an external as a temporary drive.
You may have more luck with sharing folders on the drive rather than the drive itself. As those permissions will be physically written to the folders.
Windows is more likely to ignore a removable media when it saves settings while shutting down because it could cause problems if the removable media weren't there on the next boot.