Acer 8930G, Dual Boot

Hello!! A few Days ago i Finally Saved Enough money to buy myself an Acer 8930g, and ive been wanting to Dual Boot Window XP Sp2 64Bit OS from my Pre installed Vista.

Ive Read Lots of Links From Google's Search Engine but i cannot find all the answers, Hope i could borrow some help from you guys .

i have Changed my Bio From AHCI to IDLE since i cannot run Window XP Sp2 CD at AHCI bio because i recieve BSOD.
Ive successfully installed window XP sp2 into my D:\ drive but i skipped installing ntldr and ndetect.com since it wouldnt let me install and after reboot, error comes up saying "ntldr is missing press ctrl + alt+ del to reboot" , i follow guides about copying ntdr , boot.ini , ndetect.com files from other working same OS computers to my Root of D:\ Drive and it just doesnt work.

i cannot run XP without my Boot CD.

my main questions are: 1. How can i fix ntldr missing when running XP (in IDLE Bio Setting) , 2. can i Dual Boot Vista and Xp when they are in different bio settings? (i can run Vista when i use AHCI Bio Setting, I can Only Run XP with a booting CD but i recieve ntldr missing without it(in IDLE Bio Setting), 3. ive downloaded some Drives for 8930 Do they only work for Vista Only or Do they work for XP as well?

Hope you guys would spend some time to help with my problems, im SORRY that this is not well written out.