Modems supported on Windows PE?

Are modems supported on Windows PE? Our modem works fine on XP, Vista, and 7,
but not on a customer provided PE (7 based) image. Errors from setupapi.dev:

!!! dvi: Loading module 'X:\windows\system32\mdminst.dll' failed.
!!! dvi: Error 126: The specified module could not be found.
!!! dvi: Error loading class installer: mdminst.dll,ClassInstall32
!!! dvi: Error 126: The specified module could not be found.
!!! dvi: Failure loading class installer for class Modem: status 0x7e
!!! dvi: Error 126: The specified module could not be found.
! dvi: Marked class reinstall property for class Modem
dvi: No CoInstallers found

.......

dvi: Installing device class: 'Modem'
{4d36e96d-e325-11ce-bfc1-08002be10318}.
!!! dvi: Could not locate section [ClassInstall32].
!!! dvi: Class: {4d36e96d-e325-11ce-bfc1-08002be10318}.
Install failed.
!!! dvi: Error 0xe0000101: The required section was not
found in the INF.

.......

!!! dvi: Controlling Service: Failed to open
service 'Modem'.
!!! dvi: Error 1060: The specified service does
not exist as an installed service.
!!! dvi: Error while installing services.


PS. Is this newsgroup no longer on the list of MSDN Managed Newsgroups?