First Check An Application is running or not using vba then run the code

hi everyone

i want check using vba my aap (Tally.exe) is running or not,

if tally running then run the code "Go" if not running the first open tally.exe then run the code"Go"

tally.exe path = Z:\42766\Jan 2 Dec 2014\Tally.ERP9\tally.exe

thanx