Thanks for taking the time to reply Steven
yest the HDD is there in the BIOS. I've formatted the HDD in case of corruption and also ran a repair on it too. There's two system disks with the v5535 and one is the driver disk but it doesn't have the SATA/RAID driver on it? I've tried another HDD in and get the same message when VISTA loads "this computers hardware may not support booting to this disk. Ensure that the disks controller is enabled in the comuters BIOS menu" which it is!
The closest on the CD is the M672 embedded VGA driver but that doesn't work either (was hoping the chipset driver was included). I've just enabled 32 bit I/O in the BIOS under the HDD options but that hasn't solved it so it looks to me that I need a RAID driver?