Apple's package installer for OS X does not include an uninstall option.
It is very important to uninstall iTools before reinstalling.
To do so, you need the uninstall script.
Click Here to download the script.
To run the script:
It will take a few minutes to uninstall. The files you downloaded will still be there, but the iTools app will be removed from the applications folder and the apache conf files will be restored to the defaults.