To temporarily disable it (which will help you figure out if it's the problem or if the problem is something else), use
To permanently disable it, there is a file /etc/sysconfig/selinux. You will see something like
Change it to SELINUX=disabled
I know you feel angry at it, but I'm just going to mention that it is getting easier and easier to use all the time, and there are ways to fix problems that it causes.
On the other hand, lots of Linux systems don't use it and don't get hacked, so it's probably, especially if it's a home machine, not a big deal if you disable it.