Installing Drupal

I copied my Drupal project into another machine. Now it is working fine but when i enter SITEURL/admin it is not showing user login box it is showing only access denied message. I dont know what is the issue

So far: Two years now I use drupal for my site with no problems. Lets say my site is www.example.com

What I try to do: I want to create a new site, at the subdomain books.example.com and run it with the already installed drupal, to take advantage of the multisite installations (so, when I upgrade the core or install modules, I do that once etc.)

I tried to follow the steps here but obviously I did something wrong.

What I did:
Step 1, I have already drupal running at public_html/sites
Step 2, I created a new mysql database (myname_books) and a subdomain (lets call it books.example.com)
Step 3, I created the /sites/books.example.com folder and copied there default.settings.php from /sites/default. I renamed it settings.php.
Step 4, I changed the permissions for this file (question: also for the file settings.php at /sites/default? I am not sure, so I tried both) to 666.
Step 5. I point my browser to www.example.com/install.php and I get this:
Drupal already installed

To start over, you must empty your existing database.
To install to a different database, edit the appropriate settings.php file in the sites folder.
To upgrade an existing installation, proceed to the update script.
View your existing site.

I am relatively new to Drupal and I am trying to move my two sites from my home server to a hosted server to work as a multisite with an existing site already on the godaddy server. Prior to the move, all three sites worked.

correctclass.com (existing D6 godaddy site)
math.correctclass.com (D7 site, 500 error immediately)
dev.correctclass.com (D7 site, only loads landing page but 500 error when login)

Hi
I am new to drupal...

i created a database "project_db" - its empty
On drupal database configuration i gave
Database Name: project_db
Database Username : root

Its throws this error

Can someone explain this error to me?

Have a local Acquia Stack on my Win 7 machine that I built a site on. I followed the directions on several different tutorials, latest install with https://drupal.org/node/1789226, and once I load the site, I get this error.

Hi All,

I am new to drupal and have been working on drupal from 4 weeks. My problem is described in below steps :
Our websites are running on nginx server with memcached and git installed on our server.

1- We have already running multisite on drupal framework having different theme for every new website.

2- When I tried to make the new website it runs on my local webserver but not on live server.

3- Here is what I am doing.
a. Copy the sites/all/themes/abc theme to sites/all/themes/xyz theme and replacing all text having abc with xyz text.
b. Then copying and renaming folder sites/abc to sites/xyz and updating the sites/xyz/settings.php file with new database details and keep the file in write mode with -rw-rw-r permissions.
c. Make a script file of abc database and replace text abc with xyz in that file and rename sql file to xyz.sql and import to that xyz database.
d. After this I updated the sites.php file and for new site entry as $sites['xyz.dev'] = 'xyz';
e. As all the sites running on nginx server after making the virtual host file and made its link in site-enabled.
f. After pointing the domain to my new server when I hit the url dev.xyz.com it first executes the home page and I am able to login into the admin or users section.