yee.... i have no idea what you guys are talking about here but whoever said something about the sata support in the bios was right. I changed sata to the second option (id.. something) and xp successfuly installed.
Anyway, xp didnt work that great either because most of the parts of my computer dont have xp drivers available. No wonder it was so cheap, its Vista-ready you see!!!!
Anyway, i am all happy know. I got Vista working fine. My next step is dual booting ubuntu. Sure that will be problematic but i will figure it out.