|The BIOS has nothing to do with kernel32.dll or internet explorer. |
You should not have to "clean" internet explorer 5 to upgrade to 6, as the setup has been designed to replace IE5 with 6 for you.
Getting the internet explorer 6 installer is another problem though ... microsoft have taken down the servers hosting the setup files.
That is the full installer, however I don't know if the Portuguese language packs are included.