multiple error entry logs

I have done quite a bit of searching before deciding to post this issue. While I have found that the issue has come up before, when I view the threads posted in both the "issues" section of drupal.org and the "support forums" sections of drupal.org I find the threads very hard to follow as a newbie and as of yet I have not been able to find a solution.
Here are my details.

I am using drupal 4.7.5
My database is MySQL 4.0.11
I access my site and database using a Windows XP pc
I browse using firefox (I am unsure which version but I am sure it is the most recent as I update the browser whenever prompted)

When I log into my site http://malamag.com/mala/ as an administrator
my event error log goes a little bit crazy.

I get error messages that tell me either:

1. I have been denied access to whatever node I have tried to view/edit/delete although I have just finishing accessing the node

2. I am an anonymous user although I am clearly logged in as the adminstrator

3. There are various pages that cannot be found withing certain modules and themes folders, although all of the files that are being called are in fact in the correct folders.

I am at my wits end.
While it does not seem to have affected the use of my site, administering to my site for even an hour can generate up to 20 pages of incorrect errors. This becomes a difficulty because I have to go through pages and pages of errors with a fine tooth comb to insure that I don't bypass an actual error as opposed a fictitious error.

Most of the threads I have found have touched on time zone/ userid1 and site lock outs. I am just a bit confused as to how to fix this.

I apologize if I simply have not followed the right thread to the correct solution.

Thank you for any help.