You may repair errors in a few ways.
The first is to read the log file and check which files are corrupted. Then restore them from a backup. This is the best way. Another way is to run sfc /scannow. This automatically repairs the errors but not always.
You may also try to repair your installation by booting from the Vista DVD. Then there is an option to perform a repair. The best is to perform a new clean installation from a Vista SP1 DVD or a Vista DVD with internet enabled to check for updates during installation or with up to 2GB of system memory (then after the updates you add more memory).
Check your hard disks in case they have a jumper to enable or disable spread spectrum. There is also a spread spectrum option disabled by default on your BIOS. This motherboard does not corrupt the hard disks, unless the hard disk or the memory is defective or you messed up with BIOS settings.
You may check the memory if you press tab during start up or with the latest memtest96+ ISO burned on a CD. There are special programs to check the integrity of your hard disks. You may download them from your hard disk manufacturer.
Install your X-Fi later on, after you have checked everything works fine. Disable the audio on your BIOS before you install X-Fi. Do not install any drivers after installation. Check whether everything works OK. Then install the latest drivers. Avoid programs that read sensors. Even ASUS probe gives video corruption and crash the system.
JBOD
Kevin1970 you don't need it.
This trick is good only for those who need a RAID array like RAID-0 with two disks and they also have a few other SATA disks.
Do not go on reading, unless you already have a real RAID array.
In this case go on reading how to convert the simple SATA devices to JBOD.
This way you install only the SATA RAID drivers and you skip the proprietary SATA IDE drivers that conflict with RAID.
Make a backup of your files just in case you did something wrong.
JBOD is just a bunch of disks. You enable RAID form BIOS on all SATA ports.
Then enter the raid controller during boot by pressing F10.
Create a new array. Select JBOD. Add just one hard disk to the right pane. Save this array but be carefull to check not to delete the contents of the disk. Now you may do the same for the rest of your devices (hard disks and DVD drives) one by one.
Select as bootable the disk you have the operating system.
Enter the BIOS and check your boot devices. That's it.