setup website on server2003 with sp2

i have window server 2003 with service pack 2 installed on my machine. i'm using iis6 and recently install ajax and radcontrol from telerik website(one of the ajax control toolkit) on this server. however when i run this site that i just setup, it first gave me an error of missing a dll file which i didn't have any problem with on my developing machine. also, now thati took out that asseblies, it is giving me an error of
could some one help me out please.
this is the error that i get

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The format of the specified domain name is invalid. (Exception from HRESULT: 0x800704BC) 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 
 
Exception Details: System.Runtime.InteropServices.COMException: The format of the specified domain name is invalid. (Exception from HRESULT: 0x800704BC)
 
Source Error: 
 
 
Line 97:         Dim strPath As String
Line 98:         ADSysInfo = CreateObject("ADSystemInfo")
Line 99:         strPath = "LDAP://" & ADSysInfo.UserName
Line 100:        'must add httpcontext.current in order for request to work when put in class so it gets initialized first
Line 101:

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