Install windows into mac pro (early 2008) in other ssd with RAID card

Guys, good evening to all the meantime,

I get out of it crazy to short, I humbly ask for help.

I explain my problem:

I have a Mac Pro (early 2008) with RAID CARD MEDIA installed

not using it so I"gave" to my mother which, have to use windows for work.

I pull out all 4 disks in RAID installed and mounted 2-SSD OCZ Agility 256 gb.

one of these is installed OSX Yosemite. on the other I want to install WINDOWS.

and here the problems begin:

when I insert the win8.1 proceed standard installation dvd (EFI not talked about since early 2008) I get, when I have to decide on which disk to install and format windows, does not reveal any drives installed

after 2 days of tweaking I was able to understand that it is a problem due to the RAID card installed, I also read that you just remove it and connect the SSD to one of the two empty ODDsata doors (and not in the 4 slots provided for the raid card)

but still does not see any attached HDD / SSD, so keep trying and I find that it is a driver issue, and I should install the AHCI driver, now, I'm pretty Nerd, but I still can not get out.

Can someone kindly explain step by step what I have to do to install this **** win on MacPro 8.1 designed for RAID card ???

Thank you so much in advance.

A greeting

Ruggero