Upgrading Drupal

Hi,
Be gentle I'm not technical...
My boss has asked me to upgrade the look /theme on one of their websites. The company that built and also maintain it said it was all bespoke and as such the theme was bespoke too and we are unable to change it... They could do it though!
We have limited access to the admin section on the cms.

I got this message when i try to edit my field in comment fields only, and only the 2 fields i added.
email , home page.

Error message
EntityMalformedException: Missing bundle property on entity of type comment. in entity_extract_ids() (line 7501 of /home/mixsite/public_html/beta/includes/common.inc).

I read about this problem, but i cant see any fix
http://drupal.org/node/1280884

Hi All,

I'm working upgrading a 6.24 site to 7.12. Nearly all our content is in custom content types created with CCK, and a number of those were text fields that were apparently not actually limited to 255 chars or less, because we've had users enter up to 900 characters in those fields and they worked just fine.

I didn't discover this until the CCK to Fields migration failed to migrate the data in this particular text field.

Im following the script at http://drupal.org/node/390448.

I've backed up the DB, gone to maintenance mode, and have disabled non-core modules. After hitting Save, nothing appears in the window. Any help is appreciated!!!

The meue, part of the core drupal module, has disapear after upgrade from 6.22 to 6.24.

I'm relatively new to Drupal, and I was really hoping to get some help on an issue I've been having when upgrading the views module to version 6.x-2.16. When I try upgrading the module, the appearance of the site changes and the main body of the site seems to be restricted, only occupying half of the provided space. It appears to be pushing the content to two out of four columns, rather than just two columns. I checked, and it's defaulting to four columns, but when I change it to two, nothing changes. I would really appreciate any advice you can give. Thanks in advance.