I renamed the line, and tested actually. Content of setuplog.txt before line is corrected. 04/19/2009 14:23:12.456,d:\xpsp\base\ntsetup\syssetup\ctls.c,521,,SETUP: C:\WINDOWS\system32\proctexe.ocx did not register successfully 04/19/2009 14:23:42.509,d:\xpsp\base\ntsetup\syssetup\ctls.c,521,,SETUP: C:\WINDOWS\system32\dxtrans.dll did not register successfully 04/19/2009 14:23:42.569,d:\xpsp\base\ntsetup\syssetup\ctls.c,521,,SETUP: C:\WINDOWS\system32\dxtmsft.dll did not register successfully After correcting the line. 04/19/2009 18:03:53.203,d:\xpsp\base\ntsetup\syssetup\ctls.c,467,,SETUP: C:\WINDOWS\system32\proctexe.ocx registered successfully 04/19/2009 18:04:22.185,d:\xpsp\base\ntsetup\syssetup\ctls.c,467,,SETUP: C:\WINDOWS\system32\dxtrans.dll registered successfully 04/19/2009 18:04:22.615,d:\xpsp\base\ntsetup\syssetup\ctls.c,467,,SETUP: C:\WINDOWS\system32\dxtmsft.dll registered successfully Additionally, dxtrans.dll had not existed in the file list of system information on IE8 before correcting the line. It came to exist after the line had been corrected.