Windows XP build 2600

Windows XP build 2600 is the official RTM build of Windows XP, released on 24 August 2001. PC manufacturers could sell PCs with XP pre-installed on 24 September 2001. The RTM build became generally available on 25 October 2001 with two main versions: Home Edition and Professional. It had kernel version 5.1 (2000 was version 5.0 and Neptune was 5.50). There is also a version of this build for Itanium 64-bit processors.

Bugs

 * Some installs may result in a zero day activation bug. Attempting to activate will result in no installation ID being generated, making it impossible to upgrade unless you update to Service Pack 1.