my friends internet is acting up

my friend DL an anti virus software from an external site that apparently is so good the every time he boots up it scans it self for virus it always picks up on itself due to the fact that it is from an external site WTF is wrong he "cant find a server" I know alot but not sure what this is any1 know
BTW we are on xbox live in case that could hav somthing to do with it