How do I turn on intrusion prevention for Norton Internet Security 2006

I have Norton Internet Security 2006, which has all the updates to May 2009. I also have 90 odd days left on my sudscription so the software is up to date.

 

Recenty Norton Intrusion Prevetion turn itself off and when I turn it on it stays on for about 3 to 4 seconds than turns itself off again. It has been off for about 4 weeks now and I just can't turn it on.

 

I tried downloading an update but an error on the down load page appeared "Error 5004, 183"

 

Can any body help?

 

System Windows XP SP2 with all the updates

 

Microsoft Office 2007

 

Norton Internet Security 2006 with all the updates

 

Internet Explorer 8 

 

Thank you for helping