spyware help: Webroot Spysweeper found something called “WinSniffer” that it classifies as dangerous on my PC. - Help.com

Try booting your computer on safe mode & doing a whole system scan. Sometimes norton is stupid like that. :/
I recommened you update your norton to Norton Internet Security as most sites are infected >_>
:)

Found information on WinSniffer.

http://www.emsisoft.com/en/malware/?A…

This application is a packet sniffer. Packet sniffers listen to your network or Internet connection to watch everything that you send and receive. This allows them to read all your e-mails, for example, and see what sites you visit (and any information you enter there, unless the site’s connection is encrypted). Packet sniffers can also listen to the communication from other computers on your network. If you’re on a college campus network or inside a business, the packet sniffer will be able to listen to neighboring computers as well as your own
threat level:
The low threat level is applied to software that has a low risk of hurting your computer or the data stored on it. Low threat software is not likely to be used to commit crimes using your computer as a platform, or send your files back to a hacker. It is important to note, however, that the threat level assessment is just a general guideline. If you do not recognize the software installed, and you feel that it may be causing you harm or violating your privacy, you may wish to remove it from your computer. You are ultimately responsible for assessing the danger that a software application poses.