xp looking like windows 2003?

hi guys, recently one of my relative played with my network settings and installed some netware/netbios client in my lan setting. i removed it but it has changed my xp login screen into one similar to win 2003(always prompting to pass although i dont have any and having options tab) and when i press alt+ctrl+del it shows a panel simlar to win 2003 having options like change pass, settings, taskmanager, lock computer, shutdown instead of simple xp taskmanager. also ther is an extra svchost process . want to get back to my simple xp look and need to revert the changes, i tried system restore but it didnt help. Any suggestions would be great
Thanks for helping