I installed Mint along with Windows 7 (dual-boot), and now I see on Mint desktop a CD icon named "Linux Mint Instsallation"
Currently this is the normal behaviour.
didn't I install it already?
Strictly speaking: No, not really.
The steps which mint4win performs inside Windows are merely preparing the real Linux Mint installation
which should launch automatically after rebooting the machine, but sadly this automatic startup of the real Linux Mint installation
stopped working Mint 12 or so.
This is why ever since then Mint4win users have to click the "Install Linux Mint" button manually.
what is this icon for? it means I need to finish the installation by clicking this icon?