Have a look at this article on how to remove this trojan using Norton/Symantec products:
<a href=”http://www.symantec.com/security_response/writeup.jsp?docid=2003-090514-4048-99&tabid=3″>Trojan.ByteVerify – Removal</a>
You might also want to run a <a href=”http://www.pandasecurity.com/activescan/index/”>Panda on-line scan (active scan)</a>
Hope this helps.
First, you have to make sure that your Norton Antivirus is updated and licensed. Free versions of antivirus software usually have crippled features which could only be used in its full version. This means that you have to use a latest and licensed antivirus software.