keyboard volume controls- not working

krunner,

I had the same problem and posted after you.  I found the solution, at lease it worked for me.

Click >"Start"> "All programs".  Look for "DellTouch" (programmable keys) click on this icon, a window will open that looks like the top of your keyboard.  Click "options" (top left) "Click" > Revert to Default. Or click on each button of the pictured keyboard and pick other options. 

I hope this solves your problem.

Good Luck,