@ Madiane:
Welcome at Win-RAID Forum!

Now to your problem:
If you want to create a RAID array, it is not enough to load or install a special RAID driver. Additionally you have to switch the SATA mode of the on-board SATA Contoller. Otherwise the OS will not find your system drive (SSD/HDD). Furthermore there are some special registry settings needed to get the ability to boot into a RAID array.
The "normal" and safest way to change the SATA mode is to do a backup of the important data, to set the SATA Controller to "RAID" within the BIOS, to create the desired RAID array by using the RAID Utility (via CTRL+I) and to do a fresh install of the desired OS onto the RAID array.

Please give us some more informations:
1. What are you running now (OS, SATA mode, quantity and sort of HDDs/SSDs)?
2. Why don't you want to go the "normal" way by doing a fresh OS installation in RAID mode?
3. What is the reason why you don't want to use a more actual OS than Windows 2003?

Regards
Fernando

The problem is that the system is already set up, configure and use... so here's my procedure :
I have a HDD with Windows Server 2003 R2, I used two of ''1TB HDD'' to a ''raid 1'' with control of the board and I have my original recloned on my ''raid 1'' which of course is a ''BSOD'' because the raid is not enabled in Windows.[/quote]If I understand you correctly, you have already a RAIDed HDD, but you cannot use it because of the "wrong" BIOS SATA setting?
If you really want to switch from AHCI/IDE to RAID mode from within a running OS, you may try this (success is not guaranteed!):

1. Download and unzip the 64bit Intel RST driver v11.2.0.1006 WHQL.
2. Open the Device Manager, search for the in-use SATA Controller, do a right click onto it and choose the "Update driver software" option > "Let me pick..." > "Browse my Computer..." > hit the "Have Disk" button and navigate to the file iaStor.inf of the prepared Intel RST driver.
3. Choose the Device named "Intel(R) Desktop/Workstation/Server Express Chipset SATA RAID Controller" and hit "OK". Don't care about the warnings you will get.
4. Shut down and power off your computer.
5. Start the computer, enter the BIOS by pressing "DEL" (or similar key), change the setting of the SATA Controller to "RAID", save this new setting and reboot your computer.
6. If you are lucky, you will get the CTRL-I message with the option to enter the Intel RAID Utility and to create a RAID1 array (or whatever array you want).
7. After having shut down the computer and replaced the non-RAIDed HDD by a RAIDed one (with a suitable MBR), you should be able to boot into the OS in RAID mode.