My security tab for setting file security is gone!

Relax, if you are running Pro then it's just the simple file sharing that is turned on. Open my computer/tools/folder options/view/scroll down to the bottom of the list and turn off simple file sharing.

Better? <g>

In home version it's been disabled and I haven't found a way to turn it back on yet but I am willing to bet it's just a registry setting somewhere.