Turn off popup of Window Security Alert

I’ve just reinstalled Window sp2 OS by infected virus. But it show Window Security Alert popup always. It’s inconvenient to close that. How to turn this alert off?
I search in Google what way to do. Lucky! On Yahoo Answer, a man guided that.
Double click(or right click, click Open Window Security Center ) on the Security center tray icon to open window. Then click the “Change the way Window Security alerts me” item, it’ll show a Alert Setting dialog. Here you uncheck all item and OK.
You won’t see that alert every boot your PC. Good luck!