Please try this:
1.Boot the device in safe mode.
2.Click start -> Computer -> open C: Folder -> Program files ( X 86) -> Search for Norton anti theft. Then right click on it & uninstall it.
3.Then click Start and Run.
4.Type regedit
5.Clt+F
6.Type in "Norton"
7.Delete all that comes up
8. F3 + Enter
9.Delete what ever comes up
10. keep on doing this till all Norton files are removed.
11.Reboot it in normal mode and check.