Installing Drupal

Drupal Version 6.25.

I duplicated an existing drupal page and tried to install it locally on my system.
After the Step where I entered the database information I got this fatal error Fatal error: Call to undefined function lock_acquire() it seems to be located in modules/system/system.module on line 810 but unfortunately I couldn't figure out how to fix it.
Hopefully somebody of you know how to fix it because I can't go any further and I need this duplication locally.

Thanks in advance
yves

I want to create muti sites with the same database,but each installation with different Table prefix. I am not sure if have any problem.

i am configuring drupal on my testing server "http://dev.sancharinfotech.in/pratham/" . i installed the drupal but only home page working and another links gives 404 error i followed below steps
1. Installation of GIT on my web server
2.Configuration with .ssh key generation for receiving repository on web server
3.Installation of WAMP 2.2 (php:5.4.3, Apache:2.2.22, Mysql:5.5.24)on web server
4.Creation of sub domain as dev.sancharinfotech.in
5.Cloning repository on wwwroot folder

Hey Guys,

I am having error page on opening www.anujblog.co.cc

this problem is happening from after installing some modules on my site.

Help me please, i am new to drupal.

Parse error: syntax error, unexpected T_LNUMBER, expecting T_VARIABLE or '$' in /home/XXXX/public_html/includes/file.inc on line 138

Got this error once I copied drupal files onto server and going into the website to install drupal. Was redirected to www.XXXX.com/install.php and this was the error I saw.

Help is much appreciated. My first time using Drupal.