Drupal 6.x

When I updated MySQL from version 5.1 to version 5.5 I got problems with my Drupal-installation. In Drupal (version 6.33) I received the following error-message. How can I fix the problem?

inherited Drupal 6 site with developer gone

made minor changes via unpublishing some content - now search site and search products not working - getting error in red - You must include at least one positive keyword with 3 characters or more

I'm standing at the crossroads. I have a Drupal site that, to my mind, was modestly successful.

It has teetered on the brink of being both commercially successful and a community hub, but a full-time job and part-time study always prevented me from commiting enough time to it to see if it could break through.

Then, three years ago, it became too much, and with exams looming and work pressure, I pulled the plug.

Hey!

I have ran a website for 2-3 years now. Had some problems with the website when updating the core a while back.

I get these promt all the time.

Hi and thank you in advance.
I can't find how to force shop administrator to add only products with a minimum price of 40 and maximum of 100
I'm using

Drupal 6.33 Ubercart 6.x-2.13

I love Drupal, I have since I started my little site more than six years ago.
I have nothing but high praise for the community, which has always been there in my hour of need. I could never have built this thing without your help.
And I kindly call for help again:
I am still using Drupal 6 and I need to make something appear only if the visitor of the node is the author of the node.
My PHP is rubbish, though I can go dig out a book and try to make heads or tails of it tonight at some point.