programs wont install?

hello all, recently i just reinstalled a bootleg copy of windows xp which was on my system before i wiped and reinstalled, and while im trying to install all my old programs on my comptuer i have run into 2 problems while doing so the programs windows live messanger and world of warcraft will not install, mind u i downloaded the installers from there main sites and either one of them when i go to install them i get a error of InstallWoW.exe has encountered a problem and needs to close. We are sorry for the inconvenience. and Windows Live Installer has encountered a problem and needs to close. We are sorry for the inconvenience. and i cannot figure out why i have all my drivers installed on my computer correctly and i tried installing as administraor any help would be really appreicated