Installation of Siebel Enterprise Server 8.1.1.0.0 hangs at 99% spawning 'regsvr32 /s E:\sia81\ses\s

Hi,

I'm installing Siebel Enterprise Server 8.1.1.0.0, and the process stops at 99%; the information that appears on OUI is spawning 'regsvr32 /s E:\sia81\ses\siebsrvr\bin\ssceolpr.dll..

In the log of the installation, at the end you have:

---- Part of Log ----

INFO: Setting variable 'n_countDLLLIst_var' to '2'. Received the value from a code block.
INFO: Setting variable 's_DllName_var' to '\siebsrvr\bin\ssceolpr.dll'. Received the value from a code block.
INFO: Calling Action SpawnActions10.1.0.3.4  Spawn
installcommand = regsvr32 /s E:\sia81\ses\siebsrvr\bin\ssceolpr.dll
deinstallcommand = null
WaitForCompletion = null

INFO:

INFO: Start output from spawned process: