Hi Edinaldo,
This issue could be because of the "temporary" files existing from a prior Oracle installation. To search for it, is painful. What you could do, is set the temporary folder to a different location, and try restarting the Oracle installation.
Setting the environment variables, TEMP and TMP should serve your purpose. Best set them dynamically, because you would not want the TEMP locations to be changed permanently.
Cheers!
Hemanth