[Solved] EP45-UD3P: eSATA, AHCI and BIOS help please

Ok, I'm gonna try to give you so much info as possible.

My rig consit of:
MB: EP45-UD3P
CPU: C2D E8500 @ 3.16
RAM: 4x A-Data 2GB PC6400 800mhz
GFX: XFX Geforce 9800GTX+
DVD: Samsung 52x Sata Writer
(C: ): 500GB Seagate Barracuda Sata
(D: ): 1.5TB Seagate Barracuda Sata
(E: ): 250GB Seagate Barracuda IDE
Card Reader: Random *** with 8 card slots and a USB slot
Case: Cooler Master 690 with eSata, 2xUSB, firewire and Mic on the case roof
OS: Windows Vista Home Premium 64bit SP1 OEM

So 2 weeks ago I bought another 1.5TB Seagate drive to put in my Tvix (media jukebox), I first connected it internally in my PC, rebooted and formated. Then last week I bought a Revoltec Alu Guard hdd case with eSata and USB connection. I haven't got my third 1.5TB yet (this one I'm gonna put in the case and store backups on)

Well, now the the problem.
I put the Tvix 1.5TB hdd in the case just to try it out. I connected it to the PC with eSata for faster transfer rates just to discover that it ain't plug and play. I don't want to reboot every time I connect it so I started to google for answers.
I found out that I need to activate something called AHCI in the BIOS to enable hotswap with eSata.

But when I enabled AHCI the system fails to boot, it says that it will do a test for AHCI for a couple of seconds, then some text scrolls by (the usual just before windows starts loading) and ends with "Verifying DMI Pool data".
But then I just stands there, blinking, like it doesn't recognize either my hdds or dvd drive.

I rebooted and turned of AHCI, then it goes trough the text again and stops at "Insert system CD/DVD", like it doesn't recognize my hdds.
Reboot again and press F12 at startup to go into boot sequence, select HDD, then my C: drive. Now it finally boots correctly.

I continue to google and see that you can't enable AHCI on XP machines after OS install.
And that some people have had problems on Vista pc but solved it by changing a value in the registry ( http://support.microsoft.com/kb/922976 ) . I do that and try to enable AHCI. But same problems again.

I read that some people are having problems with detecting DVD drives with AHCI enabled and they active something called Native IDE in BIOS. I see that this apparently make the SATA slots 0-3 to become something with IDE. I think that this will solve my issue and enable it without any success. I then change it back to what it was before.

About here I'm starting to give up, 5 hours of "try and error". So I startup a game and spend some time with the family.
Then this morning when I start my PC it shows the "Insert system CD/DVD" again and I need to press F12 to get into windows.

So could anyone please help me? =(
If I can't make eSata plug and play I at least want to be able to start my PC normally.

Some more info:
I haven't reformatted since I bought the PC this Christmas.
I don't know if you could change some setting for AHCI when installing the OS. I just did it the ordinary way.
I haven't flashed the BIOS either.
My C drive is on Sata port 2_0
D drive on Sata port 2_01
DVD drive on Sata port 2_02
IDE drive on IDE
My eSata ports are on Sata port 2_04 and 2_05
Nothing on my purple (raid) Sata ports