Maybe I missed that screen when I downloaded SP2. I'm using the 2005 antivirus program (it was the latest version available). But when I try to install it on XP Home I get a screen that says: WINRAR Self-extracting archive: NV11ESD.exe - ordinal not found," plus some other (to me) gibberish. I tried a new download from Symantec and another installation but same deal.
Also, you might have to do a clean boot before installing....
to go Run, enter MSCONFIG, and check off all the programs that load at startup. Also, did you UNINSTALL NAV2004 or your previous version?