WINDOWS account user problem with CAVS


I am trying CAVS (again) and have just downloaded it (build version The download seems to be working fine, except that when I switch over to one of my kids user accounts, the CAVS “last signature update” area tells me that its “not available” and its in red. I know that when I log in, it shows everything is OK. Can someone tell me if this is just Windows (I have all the latest updates and am using SP2). or is there something I need to do? When I installed CAVS I left everything in the default mode.

Any suggestions would be appreciated.