Installing Drupal

I've looked through the forums but I can't find anythijng that actually answers this question for me.

I have Drupal 4.2.0 on RH Linux 8, PHP 4.2.2. I am using the Image Module that I downloaded as compatible with 4.2.0 from the Drupal.org downloads page. When I upload a picture, it all seems to work fine. When I view the site with a Mac running OS X (10.2), the thumbnails display perfectly. When I use a PC running Windows XP, a few thumbnails appear, but others do not. I have tried the site with 5 different PCs.

I'd like to use a book page with some text in the body field as a simple template. Is there a way to create a new node based on an existing node?

Alternatively, is there a (comprehensive, please) description of how to create a new node-type (e.g. something like the feature request page on Drupal.org)?

Is there an easy way to disable the register feature? I would like to use drupal as a personal blog interface, but other users should just be able to read, and not register, modify, comment...

thanks!

Before or after running update.php, does one need to do anything else, like replacing the files in the Drupal directory with the updated editions? Or does update.php take care of all of this?

The [documentation|Upgrading from previous versions] is somewhat ambiguous on this. It suggests running update.php is the only thing to do, but it seems that it updates the database only.

i recently installed the org_informations module and the mysql database that comes with it. However when I access the "create" page I get an error message about a missing "org_informations.conf" file. That file didn't come with the install and wasn't mentioned in the install notes. (i'm running Drupal 4.2 and installed the 4.2 version of the module. I've also looked at the CVS version and that file is there either.

any thoughts?

warning: Cannot modify header information - headers already sent by (output started at /home/bbcity/www/themes/marvin/marvin.theme:205) in /home/bbcity/www/modules/node.module on line 913.

The line number for the default marvin.theme (without my site-specific modificiations) is 179.

Any ideas what I could do to solve this? Or is it a case of 'fresh install'?