Can you please make sure you're library paths have been configured correctly and that there are no files left from previous IntraWeb versions on your system?
I have copied the folder IWTmsReg into the \embarcadero\rad studio\8.0 folder and my library path points to this folder.
Can you be more explicit about which 'old' IW files you are refering to as being on this machine? I have multiple version of Delphi on this machine with multiple versions of Intra Web i.e.
D2007 - IW11
D XE - IW12 (registered copy version 12.2.8)
D XE2 - IW13
D XE3 - IW14
I have looked in the SysWOW64 folder and I have no IW*.* files in that folder