Care to provide an error code on Windows update which by researching, a bunch of websites with same related situation should provide it.
I had removed norton using norton removal tool, but it does not help.You are in Norton bondage you just have to use Norton Removal tool and after that use Revo Uninstaller Pro to delete
any leftover traces.When i used Norton Removal tool i have to say it did a very good job.
I hope i have helped