There's a few items:
1) If this is linux, be sure Apache is operating as www-data, also, try (just for testing) setting that www directory as 777 (only for testing)
If it then works you know its a permissions issue
2) If its windows / IIS, have the sys admin enable permissions, no matter who owns it, IIS perms will have to be set, WAMP I believe there is filesystem settings to allow it.