Hi John.

QUOTE:
I got warning for every page and fatal error was last

Do you mean that the data installed alright and that there are errors on the pages of Export Content under the import menu?

QUOTE:
Warning: cannot yet handle MBCS in html_entity_decode()! in /home/webadmin/dev.crackercountry.org/html/administrator/components/ com_export_content/convert_img.php on line 42

This is a known issue in some versions of PHP notably 4.3.x.
What version of PHP are you using?
http://bugs.php.net/bug.php?id=25670

Fixed in php 5
http://bugs.php.net/bug.php?id=27626

Here is some info on compatible versions of PHP for Joomla.
http://help.joomla.org/content/view/1938/310/

QUOTE:
Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 10240 bytes) in /home/webadmin/dev.crackercountry.org/html/administrator/components/ com_export_content/convert_img.php on line 42

This may indicate that you have a low upload level set on your server.

Try compiling just a couple of articles and see if it installs ok.