Windows Vista sidebar should have no effect at all.
The Adware-Url.gen is a false positive from McAfee and is most likely related to a link in the America's Army game directory (this isn't spyware/malware, McAfee simply made a mistake).
Yes you are right.
File: ..\Americas Army\Help\Play Americas Army Online With Gamespy Arcade.url
Proces: ..\Americas Army\AAUP\aaup_gui.exe
Sorry, but we cant be carefull enough these days =)