Can't install FSX

Nearing the end of the FSX install, approximately 1hour and thirty minutes,
I get the message:

"Error 1722
There is a problem with this Windows installer. A program run as part of
the setup did not finish as expected. Contact your support personnel or
package vendor."

Acknowledging this dialogue box opens another stating "rolling back" with
cpu activity for several minutes.

Then another box appears:

Error 1603

Then it returns to the desktop and the hard disk has as much empty space as
it did when I started.

I then installed a later version of the "installer" program, did a clean
boot (no startup programs) and tried again - exact same result.

Anyone else have this experience?

Blue