Please see the Supported Operating Systems for Intel® processors.
Unfortunately the Sandy Bridge will not support Windows 10 and there are no drivers available.
In this case, what I can recommend is to check if your motherboard supports Windows 10 and check for a processor compatible with your motherboard that supports Windows 10 so you could upgrade your processor in your system.
Thanks for both of your comments. I had found a different chart on this site that seemed to say that, but it wasn't as clear as this chart that you pointed me to. I'll take a look and see if I can find a CPU that I'd like to replace in the MSI board (LGA 1155).
But I'm a little uncertain about doing this because of the NX bit situation. I finally did find a place in the BIOS where the NX bit is shown, but it's "Read Only" and can't be toggled. I found a number of places on the Microsoft Forum where people were able to load Win 10 by temporarily turning the NX bit to disable, loading Win 10, then re-enabling the NX bit. That sounds kind of 'counter-intuitive' to the CPU supporting NX---by disabling it?---but it worked for a number of people---although none (that I could find) had the same CPU and board. (Further confusing the issue, Win 8 and 8.1 both have this same requirement and I had no problem loading 8 and upgrading to 8.1? Go figure!)
Anyway, thanks for your assistance and comments. Cheers!
You can check the list for compatible processor at the MSI website with your motherboard model number.
The NX used in CPUs or other features of the processor usually is controlled by the BIOS or you can enable it or disable it in the BIOS but this is a feature that depends from the motherboard manufacturer if they need to leave that feature to be toggled or not.
First, let`s check current NX state. Download util https://technet.microsoft.com/en-us/sysinternals/cc835722 , unpack it into folder, run a command line with Administrator privilege level , move to folder (dir path) and issue coreinfo. In some of first lines of output about CPU features will be NX, and a symbol: * - means supported, - - means unsupported or disabled.
Second, NX option may be locked in MB BIOS setup, because required or incompatible with other options, like UEFI boot or Secure Boot, or Boot sector protection (antivirus). Try to find information about NX option in description of BIOS settings part of MB manual.
Also, take a look into Microsoft FAQ Wiki
http://answers.microsoft.com/en-us/insider/wiki/insider_wintp-insider_install/how-to-troubleshoot-common-setup-and-stop-errors/324d5a5f-d658-456c-bb82-b1201f735683 and try recommended actions for exact error code.