Hi Fernando , i'm trying to desinstall vista from my Pavilion DV5 1199ek, how should i proceed? do i need to format my hard drive as a first step. regarding this point in your guide: "Make sure, that the CD/DVD device where you want to boot off your nLited CD, is not connected to any of the Intel S-ATA ports. Optical drives generally have problems with the enabled AHCI or RAID mode. Solution: Connect the optical drive to another available S-ATA port (for example with JMicron Controller), which is running in IDE mode. Alternatively you may replace your S-ATA CD/DVD device by an IDE connected one. " how could i know whether my optical drive is connected to an Intel S-ATA port (with AHCI enabled), is it the case for a DV5 1199ek? i have 4gb of ram and my controller is Intel ICH9M-E/M SATA AHCI, should i install an XP 64 bits? thank you for your help.