CTRL+V brings up messenger installer

CTRL+V and SHIFT+INSERT keyboard shortcuts bring up messenger installer on a XP machine running Office 2003. Recently upgraded with Feb05 patches including messenger updates. Why, by using the keyboard shortcuts does the installer for Messenger 5.1 appear/pop up? Usually a keyboard shortcut to run a program is CTRL+ALT+* right? I don’t see how Windows could allow two associations for one kb shortcut.

Thanks in advance.