132 and 140 will not run on php5. Your xamp should allow you to choose your mysql version. Set it to any flavor of 4.x
you can update to phpBB3.0.4 but you will loose your kb.
To upgrade to IM141, do the upgrade on mysql4.x
Once it is done and looks like you want, change your xamp to mysql5 and be sure it is working correctly before uploading to your site. If you are running CPanel on your website, zip up your files, upload the zip and unzip on your site. This will just ensure that none of your files get corrupted in transit. Rember to set your chmods.
There is a link in the left blocks with all the correct chmods
http://www.integramod.com/forum/web.php ... install_p1