Compiling under Win2k-Server

Hia,
   I've tried to compile and run postgresql-7.1beta4 & postgresql-7.1beta5
on
Win2k Server. I've succeded compiling the code, but whenever I try to start
postmaster, I get the following error:

*** recreate_mmaps_after_fork_failed
./postmaster: Startup proc 2680 exited with status 256 - abort

Any idea?
Moshe Shukrun, System Manager
      email:  moshiko@allcharge.com
      mobile: +972-54-956011
      office: +972-3-6126556 ext 136.
      fax:    +972-3-6126551
ALLCHARGE INC.