Car Alarms: Reactivating Car Alarm, dash area, car alarm

Question
I have a non-factory installed alarm on my 95 Altima that I recently purchased, so I do not know what type of car alarm it is.  Recently, my transmitter wouldn't disarm (It wasn't low on battery). So I disengaged the alarm with the valet switch.  I tried resetting the alarm in the exact same fashion, but so far no luck.  Is there anything else I can check before I bring it in to a pro?

Answer
Ok, try this.
   Put the key in the ignition, and turn forward
all the way just before cranking. Then within
5 seconds, press and hold in the button until
the installed LED (the blinking light)
in your dash area comes on solid.

This should be valet. This overides
the starter kill relay in the alarm harness,
and returns the car back to disarmed mode.

The only thing that will work now on your system,
is the keyless entry if installed.

Just Repeat these steps to rearm your system.

That should do it.

Let me know what happens.

ALARMTEK