PHP Shell

[ArcyQwerty <arc...@ar...>]

I have installed phpshell 2.1 according to the INSTALL file and have successfully created a user and run it
It is currently running on Windows Server 2003 R2 and IIS 6
However, I cannot use the cd command to change directory:

  $ cd C:\
  chdir() [<a href='function.chdir'>function.chdir</a>]: No error (errno 0)
  cd: could not change to: C:\/C:\

PHP is not in safemode and the process running PHP Shell is running as a domain admin (authenticated through NTLM)