Solution to Windows xp most annoying problem

I recently installed a windows vista inspirat pack on my office desktop PC. Since that pack reduced the speed of the pc i have uninstalled the pack and then reboot the machine. But after that all the things have gone. only desktop wallpaper remained. no takbar, no start button, cannot right click, cannot run explorer, cannot run iexplorer. But after searching web i fount his link that helped me to get rid of this annoyance. http://support.microsoft.com/kb/914222