Upgrading Drupal

I have just converted a D5 site to D6 . I have disabled error reporting to screen but I still get this at the very top of every page : Warning: Unknown column 'language' in 'where clause' query: SELECT src FROM lag_url_alias WHERE dst = 'node/386' AND language IN('en', '') ORDER BY language DESC, pid DESC in ......./includes/database.mysqli.inc on line 128 .

Not only that , trying to access any node at all gives me a blank page with:
Access denied
You are not authorized to access this page.

I'm struggling with the decision to upgrade from 6 to 7 on different sites with different module assortments.

I'd love to see the 'Modules index'
http://drupal.org/project/modules/index?project-status=0&drupal_core=103
as a table:

I would then be able to quickly assess if an upgrade would provide:

• absolutely required functionality
• that would be great to have functionality
• extra whistles and bells functionality

Anyone who is contemplating a version upgrade would have a much easier time making a decision & understanding what they would win, what they would lose.

I just inherited the webmaster position for an old website that was set up in 2007 using Drupal 1.94.

There are, of course, several upgrades since then. I am looking for the best (read easiest) way to upgrade to the latest version for security reasons.

This is my first foray into the world of Drupal and welcome any advice from the community. I have used Joomla on all my other websites and I sense this is an entirely different animal.

Should I try to upgrade all in one shot or must I take it one version at a time?

Appear to have successfully upgraded from v6 to v7 (although not tried to get back all modules yet). However, I cannot seem to get past display of site in list mode ie does not seem to want to pick up a default theme (using modified Garland). Have I forgotten to change something?? Getting very frustrating following all instructions.

Thxs

>> * HTTP-Fehler -110 aufgetreten, während versucht wurde http://ftp.drupal.org/files/projects/backup_migrate-7.x-2.2.tar.gz abzurufen.
* HTTP-Fehler -110 aufgetreten, während versucht wurde http://ftp.drupal.org/files/projects/entity-7.x-1.0-beta10.tar.gz abzurufen.
* HTTP-Fehler -110 aufgetreten, während versucht wurde http://ftp.drupal.org/files/projects/filefield_paths-7.x-1.0-alpha1.tar.gz abzurufen.
* HTTP-Fehler -110 aufgetreten, während versucht wurde http://ftp.drupal.org/files/projects/imageeditor-7.x-1.0-rc5.tar.gz abzurufen.
* HTTP-Fehler -110 aufgetreten, während versucht wurde http://ftp.drupal.org/files/projects/logintoboggan-7.x-1.2.tar.gz abzurufen.
* HTTP-Fehler -110 aufgetreten, während versucht wurde http://ftp.drupal.org/files/projects/views_bulk_operations-7.x-3.0-beta1... abzurufen.
*
Herunterladen von Aktualisierungen fehlgeschlagen:
o backup_migrate konnte nicht von http://ftp.drupal.org/files/projects/backup_migrate-7.x-2.2.tar.gz heruntergeladen werden
o entity konnte nicht von http://ftp.drupal.org/files/projects/entity-7.x-1.0-beta10.tar.gz heruntergeladen werden
o filefield_paths konnte nicht von http://ftp.drupal.org/files/projects/filefield_paths-7.x-1.0-alpha1.tar.gz heruntergeladen werden

While upgrading Open Atrium, while saving the settings after inactivating the modules I got this message;

Fatal error: Call to undefined function spaces_get_space() in C:\wamp\www\atrium-1-0-beta9\profiles\openatrium\themes\ginkgo\template.php on line 260

How can I correct it? Can anybody help? I'm new to Drupal