For a while some of our network PC running on Windows XP, doing a peculiar problem. Suddenly it show message that tell "pc-87 administrator account wants to log in your computer. Do you allow to log in this PC?" and "Yes" "No" button, When user press "Yes" button then this PC logging off. This is very much boring for user when they doing important work. I try to solve this problem using avast and avg anti virus but not get very helpful solution. If anyone help to solve this problem, i will thankful to him/her.