Pligg Support

Hi, i want to remove 404 error page. Suppose if any page could not be found then it will not show 404 error page, it will just go back to index page.

Could anyone please help me how do i do it?
I'm running Pligg on a local WAMP Server on a windows 8 machine. I've changed Windows permissions to Full Control but I'm still getting CHMOD errors in Pligg Troubleshooter. Help?