NIS 2009 disables after 1 hour

NIS disables after 1 hour or so and when I try to go in and turn it back on,I am unable to turn it back on. The only way I can get it working again is shutting down the pc & restarting it.

 

I have uninstalled & reinstalled NIS 3 times already,using the Norton Removal tool. A Symantec tech also done a uninstall & reinstall.

 

Called tech support & I am unable to find an answer to the problem.

 

I am running Windows XP Home with SP3. This is a fresh install on a new hard drive.

 

I am also running the following spyware :

 

AdAware

Spybot

Malwarebytes

 

and also running  ATF cleaner.

 

Is there anything else that can be done? Thanks!