Você pode reinstalar o Mu, que seria o mais viável, ou instalar um desse programas:
Visual Basic 6.0 Run-time Files
http://www.microsoft.com/download/en/details.aspx?DisplayLang=en&id=12384
Microsoft Visual C++ 2008 Redistributable Package
http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=29
DirectX End-User Runtime Web Installer
http://www.microsoft.com/download/en/details.aspx?DisplayLang=en&id=35