coin_bootstrap_1150000_1456785214_2016-02-29T22-33-34.7zun7zip to %APPDATA%\Execoin (or C:\Users\you\AppData\Roaming\Execoin
if you wish restart from beginning, delete all files in this dir except wallet.dat and bootstrap.dat.
launch execoin, it should display "Importing blocks from disk".
thanx.. that helps