Continuous boot failures vista - what shall I Do?

[HELPPLZ1]

I have a PC who suddenly failed to boot Vista.
It was set up with 2 Disks in a RAID.

I removed one of the disks and re-installed.


Everything worked perfect for 4 months... now the same problem occours.
I fail to boot, and can't enter Windows CD when trying.


Please Help..

 

[HELPPLZ1]

Worth to mention, I bought a new disk and did the Windows install on the new disk.

 

[HELPPLZ1]

The first hard drive (was 2 in a RAID) got this problem. I then removed both. Bought a new one and installed on it agian.
Now on this new drive, 4 months after this problem happand previuslly.. I have same problem agian?
On a totally new disk, 1 Terrabite large, brand new from the store.
The only thing the 2 Installs has in common, is the same DVD, Motherboard and DVD Room.
Could it be the Boot Imige on the DVD Room be incorrect? And myustically cause some sort of problem that will happand after X amount of months ^^ haha
OR Motherboard Problem?
Virus?