Inno Setup is a free installer for Windows programs. First introduced in 1997, Inno Setup today rivals and even surpasses many commercial installers in feature set and stability.
Inno Setup has support for all versions of Windows in use today: 7, 2008 R2, Vista, XP, 2008, 2003, 2000, Me, 98, 95, and NT 4.0. (No service packs are required.). Inno Setup has extensive support for installation of 64-bit applications on the 64-bit editions of Windows. Both the x64 and Itanium architectures are supported. (On the Itanium architecture, Service Pack 1 or later is required on Windows Server 2003 to install in 64-bit mode.)