First you say you CANT boot into XP 64 in your title.
Then in your post you say you CAN install XP 64.
Which is it??
Check your dimm voltage is set correctly and NOT on "Auto".
For example if you have 2.0v memory and it defaults to 1.8v, that may cause windows to not load.
You have not mentioned what error your getting. Is it a stop error? Bsod?
Sorry about my post im new to these things. Im running windows7 x64bit now i used the x86/x64bit bootable dvd.Well when I tried to boot with my bootable x64 windows xp it didnt display any error just paused a little while then continued on boot even i set my first boot on cd-rom and non other, im not good w/ computer im noob still practicing or familiarizing and need much guidance, thank you so much for taking the time. Ill try eplore more then maybe ask you again next time.
I don't understand your problem. Your have Win7 loaded on your hardrive and your trying to install XP over the Win7 and it wont install?
Yes, sir thats why im asking whats the problem, ill attached here some info of my pc hope this can help you see/solve my problem,
NVIDIA System Info:
Processor: Intel(R) Pentium(R) Dual CPU E2200 @ 2.20GHz (2200 MHz)
Operating System: Windows 7 Ultimate, 64-bit
DirectX version: 11.0
GPU processor: GeForce 8400 GS
Driver version: 196.21
CUDA Cores: 16
Memory interface: 64-bit
Total available graphics memory: 2047 MB
Dedicated video memory: 256 MB
System video memory: 0 MB
Shared system memory: 1791 MB
Video BIOS version: 60.84.6F.00.00
Bus: PCI Express x16
nvCplUI.exe 2.8.290.13 NVIDIA Control Panel
nvWSS.dll 126.96.36.19921 NVIDIA Workstation Server
nvViTvS.dll 188.8.131.5221 NVIDIA Video Server
nvMoblS.dll 184.108.40.20621 NVIDIA Mobile Server
NVMCTRAY.DLL 220.127.116.1121 NVIDIA Media Center Library
nvDispS.dll 18.104.22.16821 NVIDIA Display Server
NVCPL.DLL 22.214.171.12421 NVIDIA Compatible Windows7 Display driver, Version 196.21
PhysX 09.09.1112 NVIDIA PhysX
NVCUDA.DLL 126.96.36.19921 NVIDIA CUDA 3.0.1 driver
nvGameS.dll 188.8.131.5221 NVIDIA 3D Settings Server
If you want to get rid of Win 7 so you can install XP, then wipe the existing partition clean. Then boot to your XP DVD, and install to the newly cleaned partition.
If you want to install XP, and retain Win 7 - Then you will need to create a new drive/partition, install XP to that. Then go back and replace XP's boot manager with the one from Win 7, then tell Win 7's boot manager about the XP installation.
More to the point, though - Why would you want to do that at all?