How do you get rid of the Trojan Dyfica aj?

see the following link

http://service1.symantec.com/SUPPORT/nav.nsf/docid/2000092513515106?Open&src=bar_sch_nam&docid=2003011615553106&nsf=nav.nsf&view=df0a595864594c86852567ac0063608c&dtype=∏=&ver=&osv=&osv_lvl=

see: doxdesk.com Optimizer.exe and Dyfica.AJ are written and controlled by www.avenuemedia.com, and also has included within the Dyfica.AJ the program Bridge.dll which links back to www.flingstone.com. BOTH THESE COMPANIES ARE EVIL!