The reason I ask about the spelling is that a google search for 880uicbv5l.dll doesn't return anything.

Symantec is the company that sells the norton antivirus that you say you are using and a search at that website doesn't find 880uicbv5l.dll either. There is an entry for Download.Trojan at Symantec, that is what I linked to above.

What did you find out? Did you get it fixed?