is there a way or program to provent active sync from running

Open up A/S on the PC, then in Tools/Options untick all the boxes. This won't stop A/S from firing up every time you connect your PPC to your PC, but it will stop any syncing.

What OS are you running? If you're using XP, you could use msconfig, and on the Startup tab, uncheck the box for WCESCOMM. Or you could go modify the registry, but MSCONFIG is a little easier for the non-techie to use.

Current: Samsung i907/AT&T Epix
Retired: Palm Treo 750
Former Phones (all Windows Mobile): Cingular 8525, Cingular 8125, Audiovox SMT5600

Obviously "flexibility" has a personal interpretation.
For me this means having the control.
Therefore I use a small program to stop AS, and I have the possibility to start the AS whenever needed.
In this way in one session I may start and stop AS several times.
For stopping I use http://www.pocketpcfaq.com/applications/killSync.zip because is small and (free).
For starting, just launch AS.
But again, just a personal view.

Not sure if I am the only one but all the time I am at my comptuer, my PDA is in it's cradle syned, I then use RemoteAmp to display the now playing of Winamp. Very good when using full screen apps like a game. Basiclly, AS is always on because it is always being used.

My "My PDA" now updated with hints and tips including a ROM fix for the RX3700 series and installing Transport Tycoon onto your PDA.

i just dont it running unless i want it to run

In which case, do as kc8lir says, then when you want to run A/S, just click on the Microsoft Activsync icon in Start/All Programs. BUT...

You will then need to go into Task Manager & stop WCESCOMM, as otherwise A/S will keep on working until you next reboot your PC.

OK I HAVE JUST RELIZED I WAS (sorry about caps) clear i mean on my device i dont care if it runs on my computer i dont want it to just run on my pocket pc