Installing Drupal

Hi,

I have a web hoster who hosts for me mymaindomain.net together with a few subdomains (as he calls them) like myreddomain.com, mybirddomain.biz and mycardomain.com. These subdomains are probably mapped in his dns as they are named as standalone domains at the internet (see their names).

My web hotel is 'physically' organized like this:

/ www
--mymaindomain.net
----www
----myreddomain.com
------www
----mybirddomain.biz
------www
----mycardomain.com
------www

Hi,

1. I have a drupal installation in my hosting structure http:///mysite.net/httpdocs/drupal, that is http://mysite.net/drupal.

2. Then i want to copy /drupal directory to http:///mysite.net/addon/mysecondsite.net/drupal to define another http://mysecondsite.net/drupal

3. What I want is: share the same content, users, etc.. Hense the same $db_url connection.

I am attempting to install Drupal 7 on Godaddy (having uninstalled a 3 week old 6.2 installation)(I am a total beginner) I believe that I have correctly uploaded 7's file to root directory of host but when I attempt to log into my site ACADUI.COM I get the following errors:

Warning: Unterminated comment starting line 5342 in /home/content/76/7118176/html/includes/common.inc on line 5342

Fatal error: fatal flex scanner internal error--end of buffer missed in /home/content/76/7118176/html/includes/common.inc on line 5342

Okay, so I have used Joomla and even Mambo in the past. I am proficient with HTML, CSS, XML, and I can look at other people's PHP and tweak it. Yet now that I have an instance of Drupal up and running on the web, I can't seem to figure out how to make it do anything.

Here's what I would like to do, for now (I want much more out of the site later, but... baby steps!);

A) A registration/login system
B) A user forum
C) User profiles (that can be viewed by all)

How hard is that? Apparently too hard for me to do, right now!

As i am trying to integrate drupal with db2 i am going untill 4th step of installation that is install site but here in this step its hanging not showing me progress bar please help me how to overcome i searched for this in drupal site and googled around i followed all the steps of increasing memory limit, and checking version of php,and i deleted cookies and even tried but i am strucking in this step please any one tell me why its going wrong in this step and if any one have idea of how can i track the code in drupal going to installation step so that i can know cause for my error please h

I have updated my drupal 6.20 site to drupal 7 in local development environment (xampp).

Then I uploaded database and all files to web server and changed database connection info in settings.php according to the web server.

Now the site working as well as. But unable to get update information..
I am getting the following errors in status report :