From a previous install of windows xp with ie8 slipped streamed, i had noticed that my setuperr.log was empty, but further looking into the setuplog.txt there was this inlcuded towards the end! 05/02/2009 19:22:51.437,d:\xpsp\base\ntsetup\syssetup\ctls.c,444,,SETUP: file to register is C:\WINDOWS\system32\occache.dll... 05/02/2009 19:22:51.531,d:\xpsp\base\ntsetup\syssetup\log.c,133,,Setup could not register the OLE Control C:\WINDOWS\system32\occache.dll because of the following error: GetProcAddress returned error 127 (the specified procedure could not be found). So even if you don't have anything in the setuperr.log, you might want to look at this file too.