HELP! NIS 2009 keep showing AT RISK.

Hi, recently I bought a 3-user NIS 2009 online.

I've no problems with the 1st 2 computers but the 3rd one,

running on a XP, keeps showing AT RISK.

 

When I pressed FIX ME, there was no response.

And when I try to click on LIVEupdate, update have all three areas in crosses.

 

When I tried to mannually update by going http://www.symantec.com/business/security_response/definitions/download/detail.jsp?gid=n95

to install new definitions, the AT RISK will be gone,

yet LIVEupdate only managed to have the first area ticked, and the other two crossed.

 

Please help...

I do not know where to go from here if my LIVEupdate keeps on unable to update itself,

and I worry I might get virus attack if I don't do mannual install of definitions in time.