When installing K2 Blackpoint (http://www.k2.com/en/blackpoint.aspx) you might encounter the following error:
Exception: Value was invalid.
Parameter name: sddlForm
StackTrace: at System.Security.Principal.SecurityIdentifier..ctor(String sddlForm)
at SourceCode.SetupManager.Program.Main(String sArgs)
If this error occurs, it is due to the fact that K2 Blackpoint uses Active Directory, thefore it requires the logged in user to be a member of a domain and not the local computer.
If this error does occur, need to make sure AD is even installed on the server, for information installing AD on Windows Server 2003, check out: http://technet.microsoft.com/en-us/library/aa998088(EXCHG.65).aspx
Once the user trying to install K2 Blackpoint is part of a domain, they will be able to proceed without receiving this error.