Getting a lot of alerts from symantic programs trying to access themselves

Please bear in mind I've just re-installed(see my thread "not starting") if you want to.

 

I'm getting alerts to and from a number of symantic programs an example being something like:

 

Actor: ... svchost.exe

Target: ... nisoptui.exe

Action: Unauthorized access

Reaction: Unauthorized access stopped

 

 

This happens with a number of NIS programs and occasionally the "Actor" is windows explorer

 

Can anyone say what this may be or if its a cause for concern (there are alerts frequently)

 

  

NIS2008

Vista Home Premium SP1

 

Thanks

Tony