Need Audio Device setup help…

I’m attempting to record from a Soundcraft Si Performer 2 live mixer through the USB port on an installed Si Multi Digital card using their Soundcraft_SI_USB_Driver_V6_14_0 installed on a Lenovo W540 laptop running Windows 7.
 
The driver installed itself to the “Program Files” directory (instead of “Program Files (x86)”), suggesting that the installed drivers are 64 bit.
 
On this machine, I’m running SONAR X3 (32 bit) (not yet having the courage to run 64 bit yet).
 
In SONAR’s Preferences/Audio/Devices page, I can see the Soundcraft device’s inputs & outputs listed, but they’re all greyed out and not selectable.  The only thing that’s selectable is the ASIO4ALL wrapper for the laptop’s onboard audio device.
 
On the Preferences/Audio/Driver Settings page, the Playback and Record Timing Master dropdowns only list ASIO4ALL.

• What do the greyed out Input & Output Drivers selections under Devices mean?
• What do I need to do to make these selectable?
• Are the audio device drivers exclusively 32 or 64 bit?
• If so…how would you install the 32 bit driver on a 64 bit machine/OS?
• What else is there that I’ve missed?

Thanks in advance for all your help and for not asking what brand of hard drive or USB cable I'm using or whether there are cat pictures used as desktop wallpaper.

you could check your interface home site
for 32bit drivers perhaps? 

We've recently had more and more members have issues with asio4all. Even having it installed on a system has created problems with other drivers.

It's pretty easy to uninstall to at least give it a try.
I doubt trying to run x86 drivers while running Win x64 will work. Drivers are connected between the OS and hardware.

It's clear you're running Win x64 why not give Sonar x64 a try. You don't have to do anything more than install it with only Sonar x64 plugins. There's more than enough 64 bit Sonar plugins that you could work without any others.