Help with install Drupal 7.7 / update from Drupal 6.22

Hi evereybody..
After some days of try and error..i obtain unfortunately only error.. :(
The goal is: obtainig a Drupal7.7 installation ok on a NetGear Ready NAS Pro with 4.2.18.

The 2 ways i used to obtain the goal are the following:

A- upgrading from Drupal 6.22 to Drupal 7.7

B- installing Drupal 7.7

A. The step i do in this case are the following:
01. Download the bin file created by Super Poussin based on Drupal 6.6 ( viewtopic.php?f=48&t=22732 ) (OK)
02. Install from the web interface of my PRO (front view) . (OK)
03. Launch the setup from the web interface (OK)
04. Downloading from the official Drupal site tha latest Drupal 6 version (the 6.22)
05. Follow the instruction to upgrade (put the site in maintenance mode, launch the update.php,etc.etc.) (OK)
06. Connect like admin and put the site again in normal mode. (OK)
07. The site is now OK with the 6.22 release. (OK)
08. Download the 7.7 Drupal Release from the official site (OK)
09. Follow the instruction to upgrade (put the site in maintenance mode, launch the update.php,etc.etc.) (OK)

At the end of the previous operations i see the following messages:

user module

Update #7000
•User passwords rehashed to improve security

Update #7002
•Migrated user time zones

Update #7014
•Renamed the 'post comments without approval' permission to 'skip comment approval'.

system module

Update #7007
•Inserted into {role_permission} the permissions for role ID 1, Inserted into {role_permission} the permissions for role ID 2



It's seem no big problem occurred..but...it's no more possible to put the site in Online Mode..there is no more possibility to connect with any user..

10. Connect like admin and put the site again in online mode. (KO)


I receive the following error messages:

•Notice: Undefined property: stdClass::$content in include() (line 9 of /c/webroot/drupal/themes/garland/block.tpl.php).
•Notice: Undefined property: stdClass::$content in include() (line 9 of /c/webroot/drupal/themes/garland/block.tpl.php).

B: The step i do in this case are the following:
01. Download the 7.7 Drupal Release from the official site (OK)
02. Follow the instruction to install opening the browser to http://nas_ip/drupal (KO)

I receive an HTTP 404 Error..and nothing else.. :(

Is there anyone that have already tried to do this job...?
I need please some help to obtain the goal..

Thank you very much to every people who try to helping me dedicate the most important thing in our life.. time

have a good day..
m64

PS.
These are the specifications more in detail of my PRO
(it should be right for the Drupal system requirement):

Firmware : 4.2.18 (O.S. Linux nas_1 2.6.37.6.RNx86_64.2.1 #1 SMP)
Web Server : Apache 2.0
Script PHP Language : 5.2.17-rnx86-1.4.6.bin
DataBase MySql Client : 5.1.47
DataBase MySql server : 5.0.32-Debian_7etch5
PHP MY Admin : 3.3.8.1