XP's firewall

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From: Unprotected (anonymous_at_discussions.microsoft.com)
Date: 03/08/04 

Date: Mon, 8 Mar 2004 14:44:29 -0800

XP's firewall keeps unchecking itself,I check apply and
it stays on,sometimes for 2 days,but always seems to shut
itself off.It's a Dell,w/home,McAfee AV had the
firewall from them but it expired,and I figured I didn't
need one ,Because XP has one built-in.What keeps turning
it off,Do I have ghosts,or is my computer already hacked?