Installing Drupal

Hello friends. I am new to this community and have a few questions for you. I have recently installed dupral and seem to be running into quite a few issues. Though some of the pages information is loading, I am getting the following errors on the main page

errors on page
and
Access Denied. You are unauthorized to access this page.

i am facing the Pdo exception when moved my drupal 7 site to the hosting server environment.
[16:32] PDOException: SQLSTATE[HY000] [2000] mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool to reset your password with the command SET PASSWORD = PASSWORD('your_existing_password'). This will store a new, and more secure, hash value in mysql.user. If this user is used in other scripts executed by PHP 5.2 or earlier you might need to remove the old-passwords flag from your my.cnf file in lock_may_be_available()

I have installed Drupal 7 and wamp server. It was all running.
Then I wanted to install Recruiters, but not as a module.
I've deleted the drupal database on phpmyadmin panel.
I've downloaded the zip file and put all the content inside to C:\wamp\www\drupal\
After that I've opened a new database named again drupal on phpmyadmin. But of course, it is empty. I couldn't find a way to import the recruiters zip file to the database. Now I'm having the following errors:

Hey,

First time I installed drupal 7 and it worked well.

Several days later I installed some modules like entity-translator, ctools etc. and then it showed errors beyond my knowledge.

I emptied the database and wanted to reinstall.

Second time, I installed drupal 7 again. It looked good but I could not do anything even add a content after installing.

There is no response when I click "add content" or some menus. I do not know why it happens and how to solve it. Does someone have the same issue? thanks

What is error all about please :(

Warning: require_once(D:\Hosting\11422666\html/includes/install.core.inc) [function.require-once]: failed to open stream: No such file or directory in D:\Hosting\11422666\html\install.php on line 25

Fatal error: require_once() [function.require]: Failed opening required 'D:\Hosting\11422666\html/includes/install.core.inc' (include_path='.;C:\php\pear') in D:\Hosting\11422666\html\install.php on line 25

I've recently taken over the administrative duties for a website that was completely designed and administered by someone else. My boss has given me the keys, so to speak, but I want to make a local copy to play around with before making any changes on the live server. Here's what I've done so far:

1) Used FileZilla to grab the entire file directory from the server.
2) Created a backup of the SQL database using "Backup and Migrate.
3) Installed Aquia Dev Desktop to administer the site.