Bazaar 2.2.1 Windows installer fails

[Eli Zaretskii]

It runs to completion and then pops up this error message:

    Unable to execute file:
    D:\usr\Bazaar\bzr_postinstall.exe

    CreateProcess failed; code 14001.
    This application has failed to start because the application
    configuration is incorrect. Reinstalling the application may fix this
    problem.

(D:\usr\Bazaar is where I install Bazaar.)

Bazaar is non-functional after this.

This is Windows XP SP2.

I saw the same problem on another system, also a Windows XP.

Help!