Let me explain, there is various Programs to Protect exe/dll's from reverse engineering with tools such as SoftIce, OlyDBG and so forth. They have lots of fake OEP, detection of SoftIce (In-Line Debugger) and so forth. V1.x got cracked and people even make a simple "Click me to deprotect programs". AsProtect 2.x, Armadillo 4.x and so forth is good, it even Encrypts the code in Ram - so mere dumping aint gonna get you far.
I am not saying its Impossible but I am saying that you will need to learn A Hell of a lot by which time the real server will probably be shared. When I embarked on the de-protection of Mir3 Server files, I was like yourself, had no idea were to even start. I started following guides to de-protect Supplied CRACK-ME and known programs to learn instead of jumping in on some unknown code and I am still to this day trying to crack it.
After plodding through 500 Guides, you will be no futher then you are now, here is a few sites though to get you started:
http://tutorials.accessroot.com/
http://www.tinicat.de/hacnho/
Good luck tbh !!
OH and:
IDA 4.15 - Disasemmbler - little use on a Protected App.
Soft Ice on Win2k - Most protections will Stop this from running.
LordPE - Dumper - only handy as a starting block
Revirgin - No idea