Thanks for the tips, but I don't have any choice to change harddrive configs in BIOS :(
As for the USB FDD method, I couldn't find the mention of usb on that page anywhere, can you elaborate?
Also, I've looked around the installation files, and all the driver files had the last letter of their extensions changed to "_"
So amd_sata.sys would be AMD_SATA.SY_ etc.
So I changed everything to the regular extension, and slipstreamed it again, and now during the installation, it says the file is corrupted ...