Norton AntiVirus Virus Definition

The thing that we did was install Norton Anti-Virus.It isn't free but it was sure cheaper than buying McAfee again. But yes, I think I have heard that AVG is a good security center.My friend has it on their computer and it works well....
Download
http://definitions.symantec.com/defs/20091216-003-v5i32.exe
ftp://ftp.symantec.com/public/english_us_canada/antivirus_definitions/norton_antivirus/20091216-003-v5i32.exe
http://definitions.symantec.com/defs/20091216-003-i32.exe
ftp://ftp.symantec.com/public/english_us_canada/antivirus_definitions/norton_antivirus/20091216-003-i32.exe