Windows Vista build 5259

This build is the first official build to include the Start orb (although it was in build 5212.vbl_ux but not in the leaked 5212.winmain) as well as the last known build compiled under the Pre-Beta 2 branch; the next build (5270) was compiled under the Beta 2 branch.

Windows Antispyware is now added, and the setup UI is revamped, including a new Aurora background as well as a new OOBE. There's now an option to change the aero glass color.