Drupal 4.7.x

Drupal 4.7.6 mysql 4.0.26
Everything was working until this morning but now when I try to attach a file to a page (which I have been doing) I get a pop up with the following

Tried upgrading from 4.6 to 4.7 - for various reasons (1and1 not giving access to error logs and the previous developer is no longer available) it was a wash. Now considering moving to new ISP and starting with 4.7 fresh.
I'm wondering how difficult it will be to transfer my content - users and various postings. Is this even worth tryin? Should I import my users and have an admin copy and paste content? Is 4.6 so different from 4.7 that node data cannot effectively be transferred by adding content to the mysql database on the backend?

Running 4.7.6, and now I can't get a block with PHP to execute the PHP. The thing I changed recently was putting my site into maintenance mode and disabling all contributed modules. I have re-enabled all modules, but now PHP code in blocks does not execute.

Specifically, I have PHP code for Text Links Advertisements. Note: I am not using the TLA Drupal module.

LiCI, Linux Certification Institute is the first GNU/Linux and free software only teaching school in Italy.

It's LPI (Linux Professional Institute - http://www.lpi.org ) official partner to certify Linux sysadmin.

http://www.lici.it

I am a seasoned php developer, but a total Drupal n00b. I'm tripping over myself and the online documentation trying to find out how to get started developing for drupal.

Can someone point me to something "Hello, World!" simple so that I can get my feet wet?

Thanks to all in advance.

Steve

Site broken/down every page shows a huge error and also cant login.

Error message starts with (see below)

You can see the full message here http://www.omatila.com/

What caused this and how can I avoid this in the future?

Any other way to deal with this than to restore things from backup.

Any help appreciated Thanks.

"Warning: Can't open file: 'cache.MYI' (errno: 145) query: SELECT data, created, headers, expire FROM cache WHERE cid = 'variables' in /home/omatilac/public_html/includes/database.mysql.inc on line 121

Warning: Can't open file: 'cache.MYI' (errno: 145) query: LOCK TABLES cache WRITE in /home/omatilac/public_html/includes/database.mysql.inc on line 121