I think you can create an integration installation folder with the Standard RTM installation CD you have and SP2 installation package,
http://www.microsoft.com/downloads/details.aspx?familyid=95AC1610-C232-4644-B828-C55EEC605D55&displaylang=en
The integration installation folder can be created following this KB for Windows XP,
http://support.microsoft.com/kb/894351
Then you can point the installer to that integration installation folder when it asks for missing files.