Well, in that case you first need to disable the system restore feature and run a full virus scan (I recommend the Trend Micro online scan) and clean your system. If you have prollems getting on the internet, try booting in safe mode and empty all temp files, do a disk cleanup cleaning ALL segments. Then reboot and run virus scan.
Oh, another thing - disable Norton's "Live update" feature. It WILL screw up your internet time - but seriesly!