Apache / Wamp not starting in Windows XP

1. Check the Apache, MySql and PHP log files for any errors.

2. Check whether any other application is running on same port as described below

Commands to see the process list along with Process ID (PID)

Netstat –o

netstat -aon

To Kill the process using ID

taskkill /PID 827

To Forcefully Kill the process using ID

taskkill /F /PID 827

More Information can be found at :

http://www.tech-recipes.com/rx/446/xp_kill_windows_process_command_line_taskkill/comment-page-2/#comment-55243 

http://www.tonerdesign.biz/web-design/46-learning-about-netstat.html

http://phptofun.wordpress.com/2012/03/05/wamp_instillationerror/