problems with installation php4b3

Hi, I'm trying to install php4 beta 3 on a winnt server with iis4 and after adding the isapi filter and adding the extension .php in my home directory tab, i stop and restart the w3svc service and get an inetinfo error not letting the service start. Can anyone give me a help with this....maybe some better installation instructions... Also, the imap and mssql modules for php4....are they the same from php3 or where are they.... Thanks, Carlos Castro ccastro@ideianet.pt www.ideianet.pt