Moved this to the appropriate area. If it's quarantined then it is out of harms way. You can remove it entirely by opening the SecurityCenter, double-click the taskbar icon to do that.
If you have 2009 VirusScan (taskbar icon looks like a white M in a small red square) then click Advanced Menu (bottom
Click Restore (left)
In the right-hand pane click Files and delete it there.
(Going by memory, hope that is right).
In the 2010 version (taskbar icon is a white M in a red shield) click Navigation (top right)
Click Quarantined and Trusted Items in the main menu that appears below that
and delete the item from quarantine, it will then be gone.
User reports matter solved.