plz tell me how can i solve this problem >?

Site info:

Site package - plain_site
Title - Plain site
URL - http://192.168.1.206/testeZ/index.php/plain_site
Admin URL - http://192.168.1.206/testeZ/index.php/plain_site_admin
Access type - url
Access value - plain_site

Web server info:
Version - Apache/2.2.3 (Red Hat)

PHP info:
Version - 5.3.4

OS info
Name - Linux linserver2.jzero.com 2.6.18-194.el5PAE #1 SMP Tue Mar 16 22:00:21 EDT 2010 i686
CPU Type - Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz
CPU Speed - 1600.000 MHz
Memory Size - 4212879360 (3.92 GB)

Database info:
Type - MySQL Improved
Driver - ezmysqli

Email info:
Transport - sendmail

Image conversion:
ImageMagick was found and used.
Path - /usr/bin
Executable - convert
ImageGD extension was found and used.

Regional info:
Primary - eng-US
Additional - eng-US

Critical tests

directory_permissions - Success
phpversion - Success
database_extensions - Success
image_conversion - Success
safe_mode - Success
memory_limit - Success
execution_time - Success
magic_quotes_runtime - Success
allow_url_fopen - Success
accept_path_info - Success
php_session - Success
file_upload - Success
zlib_extension - Success
dom_extension - Success
iconv_extension - Success
mbstring_extension - Success
timezone - Success
ezcversion - Success

Other tests:

variables_order - Failure
php_magicquotes - Success
curl_extension - Success
imagegd_extension - Success
imagemagick_program - Success
database_all_extensions - Success
php_register_globals - Success
texttoimage_functions - Success
open_basedir - Success

I had downloaded eZpublish 4.5 version from internet
then i had overwrite it in my folder "/var/www/testeZ/"
then when i access my site
"http://192.168.1.206/testeZ/index.php"
it is showing setup wizard .............at the end i got this error

EZSW-004
Failed inserting data to mysql
Table 'ezapprove_items' already exists

I am not understanding difference between installation script and upgrade script.

i did this thing ...after that i am facing same problem for 3 more table .......then again same table error come

I am getting this error after upgrading eZpublish version from 4.3 to 4.5

EZSW-004
Failed inserting data to mysql
Table 'ezapprove_items' already exists

Hi
my current site is using eZpublish 4.3 version
I upgraded its version to 4.5
but problem is that it is generating new database .
i want to work on my old database with new version 4.5
if i upload old database to new then my site is not working