Trying to get d3 running on a laptop.

I try to run d3....Nothing.
Try again..Diablo 3 is already running.
CAD end process on d3.
Run D3....Nothing.
Run D3...Diablo 3 is already running.
Check for driver updates.....Drivers are up to date.
Tried deleting files in b.net and other folders suggested by posters in similar threads.
Did a complete reinstall of Diablo 3.
Same issue.

pls help.