Carlos
Try this
Reboot to Safe Mode
Open Device Manager
Remove ALL IDE Controllers and subsidiary devices (HD/CD/DVD)
Remove ALL duplicated devices
Remove ALL error-flagged devices.
Reboot to Normal mode - windows should reinstall the required drivers
See if that helps

Signature
Noel Paton (MS-MVP 2002-2003, Win9x)
Nil Carborundum Illegitemi
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> Hi I have lost Serial Ports, PCI and Modem in Device
> Manager. Using "System Information" I got the following
> errors:
> Secondary IDE Controler - Error 29
> ACPI IRQ Holder for PCI IRQ Steering - Error 22
> Could you please send me a procedure to recovery them?