I made a correct installation,
then I was adding some products to the site, but after saving I get an error message and now
when i go to the site adress, installation page is back.
Now if I try to reinstall on the same istance of the db I get this error.
An error occured: There is already an object named 'Nop_CustomerSession' in the database.
Running scripts from file: d:\hosting\xxxx\xxxx\xxxx\install\Scripts\nopCommerce_createDatabase.sql