Care to help ?

I had a similar case for my pc the other day. Try detaching the SATA/IDE cable from the hard drive. Turn the computer on to allow the post to reconize thier is no bootable drive. Shut the computer off. Reattach the SATA/IDE cable to the hard drive and turn the computer on. This should make it so the computer can read the hard drive. Once or if it boots into windows download a virus and anti malware program immediately such as AVG free, or malware bytes, super anti virus, and get firewall protection such as zonealarm.

i think u need to make a user account from user accounts in control panel.hen login to that user and install the norton 360 then it will work safely and also been viewed in admin ac also.Do this procedure.

First of all make sure that the Norton360 is totally uninstalled from your PC following which run a software like TuneUp Utilities and clean your PC totally, then start and try to install your licenced copy.

http://symantec.pcperformancetools.com/norton-360-how-to-uninstall.html