You'll Need a 64bit OS & Processor (im using Windows 2003 R2 Enterprise Edition x64 with C2D E6300 @2.8ghz and 2gb of ram)
MSSQL 2000 will work for the database
follow the C1 guide (it does work, i should know i followed it when setting up the C4 Offical Files)
setup the File DSN's but you'll have to go into the system32 folder and use the odbc program in there, the one from the control panel doesnt work
when you boot up the authd, pay attention to what the errors say, if they say they cant find the field for port & reigion in the server table, put them in, if you dont know how, then read a tutorial on SQL
the Geodata that come with the server is incomplete, you can find home-made geodata out there to get everything working
its not rocket science i had the server working with in a few hours, including installing the OS and SQL Server, if you run into any problems post your problem up here, and i'll give you some hints and maybe some others will too