Can not install win 7

Dear Friend
This day I help my friend to install new windows 7 on my friend,s computer which OS is windows XP. when I try to boot from DVD to install win 7,I get into bios setup and change boot priority from harddisk to cd/dvd. (I try usb dvd,also try internal dvd with data cable sata,I can not try ata dvd because no one have it again (discontiinued), Whatever i do ,I always have windows Xp load again and never get in as ussualy popup message " press anykey to boot from dvd" .Will you help me please ? I will apreciate that for helping me. By the way i have try using auxiliary cable to make Internal dvd rom become usb drive (ide to sata converter cable), The result is not working too.

Unplug all other HD's and peripherals,

Boot into BIOS setup, reset to defaults, save changes. If an EFI BIOS you'll need to decide if you want UEFI BIOS vs. Legacy BIOS. If UEFI follow these special steps for Install, otherwise enable Legacy BIOS or Compatibility Support Module to proceed with normal install:

Set DVD drive first to boot, HD second, set SATA controller to AHCI, Save changes and Exit.

Then boot into Windows 7 installer DVD or flash stick burned or written using tool and latest ISO for your licensed OS version here. I would use a fresh ISO written with tool in Step 2 as yours is in question. Plug the DVD drive in internally. If it fails, use USB flash stick install. How to Boot A Computer from CD or DVD - YouTube

At first installer screen Press Shift + F10, or enter System Recovery Options to open a Command Box, type:

DISKPART
LIST DISK
SELECT DISK 0 (after confirming Windows 7 target HD #)
CLEAN
CREATE PARTITION PRIMARY
FORMAT FS=NTFS LABEL="WINDOWS 7"
ACTIVE
EXIT
EXIT

Next click Install Now, then Custom install to Clean Install Windows 7 to the partition you created. If it fails then report back at which step and the verbatim error message.

In addition read over these steps to understand the tools and methods which work best to get and maintain a perfect Clean Reinstall - Factory OEM Windows 7. The steps are the same for retail.

After install you can adjust partition size or Create new partitions for data, etc. in Disk Mgmt. You are creating the partition here for the purpose of wiping the HD and marking Active which overcomes certain install failures.

For Gregrocker,
Thankyou so much,its work,and thanks for help

You're most welcome. Enjoy Win7.

Remember to stick with the tools and methods in Clean Reinstall - Factory OEM Windows 7
to get and keep a perfect install.