Well for one thing goto your boss. Your IT guy is no IT tech if he can only do one kind of computer! I guess from you post you want to JOIN a Windows 2003 workgroup or domain, am I correct? I also assumed you first went into /Applications/Utilities/Directory Access and turn on the capability. I also have been watching MacWindows.com and have seen a typical 2003 fix as described in the website MacOSXHints.
Mac Pro Dual 2.8 Quad (2nd gen), 14G Ram, Two DVD-RW Drives, OS X 10.8.3
2006 Mac Book Pro 2.16 (first Gen) OS X 10.7.4
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32G iPhone 4S Black, iPad (3rd Gen) 32G Black