I had a file missing a ntfs.sys so i put in my xp cd and copied it. when i was finished i took the cd out and exited and it rebooted. but i noticed that it had service pack 1 on there now not 2 and it wont go to desktop but instead it keeps asking what mode i want to start windows in. I tried safe mode and normal mode and it still wont go to desktop. can someone plz help me?