Installation don't start on remote

[aston]

hi,
on local server is everything ok, but when i try to install the GS 3.0 package on my remote host ( register.it ) and i go to mydomain.it/admin/install.php i get only a blank page with this text " il sito web non è al momento disponibile".

i also try to put the files of the package on a subfolder, but nothing happens..

some tecnical help please..