infostealer virus, blocked but unable remove

My computer is infected with infostealer virus, currently using Norton Internet Security 2010, NIS 2010 keep prompt me that infostealer is blocked and my computer is protected, but this issue happen many time, anyway to remove this and get rid this threat so that NIS won't prompt me the threat again because is completely removed?

 

thank you.

 

infostealer.jpg