Module development and code questions

I previously asked about permissions and the like...

Is there a set of modules already available to do the following?

- Allow students/users to post/upload files on a page
- Teacher/admin can download the files
- Files cannot be viewed by other users

If there isn't, what is the best way to go about implementing this?

I'm very new to Drupal. I want to give users basically their own web sites that they control using the Drupal system on my servers. This means enabling/disabling modules for their personal site, editing comments on content they've posted, administrating module options within their site (configuring comments for their site, etc.), allowing users to use different themes for their site only, allowing them to create their own basic themes easily and add complex themes that they've created, for use across the system or just on their site depending on specification, etc.

I'm currently using the captcha module but am concerned that I am turning people away. Would you recommend that I continue using it? What are the risks if I disable captchas during registration? How would it compromise the security of my site if ever?

Thanks in advance! :)

Hello Everybody.
Im very fresh to Drupal, with a lot of stupid questions. so lets get it on...
I want to use Drupal for an Anime Model kit Review Site.

A Modelkit should be defined by the following things:

The problem: Yahoo! web hosting does not allow directory names with periods ('.') in them, so the Drupal feature that allows you to have multiple sites from a single Drupal installation does not work as is.

Work around: Yahoo! does allow you to put an underscore ('_') in a directory name, so I named my site directory, for example, store_purpleeor_com. Then, you look in includes/bootstrap.inc and you see this line in function conf_init():

I have the event module installed and all seems well except for this obvious little problem. The date on the calendar and upcoming events block is always wrong unless the user is logged in. The date for anonymous users changes but seems to always be behind.

Since I can find no reference to this problem in the forums, I'm thinking it may be related to the theme I'm using. When I change themes, sure enough the calendar is correct. The problem is I really prefer the pushbutton theme!

Any help here appreciated!

Drupal 4.6.3, Event 4.6.10, Theme: pushbutton