|"and never lagged its happened right after i|
installed xp , help please :("
Chances (if you where using WiFi which never recommend for games) that it is just coincidence because something new is causing inference on your WiFi. Try changing the Wireless Channel on your Wireless Router.
There may have been a driver or program that came with your laptop that boosted the power on your WiFi NIC so you may want to download the latest driver but my guess is if you change the wireless channel on your router it will fix things.