When Dialer.Winmuschi runs, it displays a window inviting you to access "my webcam" using a premium rate telephone number.
This dialer program is installed through various Web sites, mainly with pornographic contents.
It copies itself as %Windir%\Winmuschi.exe.
It also creates a link to itself on the Windows desktop and adds itself to the Start menu.
Delete the link on the Windows desktop and from the Start menu.
Use antivirus (also check How To Remove section)Startup Optimizer to remove it from startup.