Computer won't boot from CD drive

[TTuT6yJI]

I have windows XP on my computer and I wanted to instal windows 7, I use a gigabyte motherboard, I have changed the boot priority so the cdrom will be the first and the hard drive the second.I saved it and then restart the computer.nothing special hapend...windows xp started as usuall..I cheked if i saved the chenges of the boot and it was ok...does someone know's what to do with this problem??
sorry for the mistakes if in the languge if I have..english is not my mother lenguge

 

[prestocreams]

"With your computer on and Windows XP running, insert the disc into your computer. Setup should start automatically. If it doesn't, click Start, click My Computer, open the Windows 7 installation disc on your DVD drive, and then double-click setup.exe.
If you've downloaded Windows 7 rather than buying a DVD, browse to the installation file you downloaded, and then double-click it (often identified as an Application file under the Type column).
If you've created a bootable Windows 7 installation USB thumb drive, insert the drive into your computer. Setup should start automatically. If it doesn't, click the Start button, click Computer, double-click the drive, and then double-click setup.exe.
On the Install Windows page, click Install now. On the Get important updates for installation page, get the latest updates to help ensure a successful installation, and to help protect your computer against security threats. Now click I accept the licence terms, and then click Next.
Now on the Which type of installation do you want? page, click Custom. Choose the partition containing Windows XP (this is often the computer's C: drive), and then click Next.
In the Windows.old dialog box, click ok. Follow the instructions to finish installing Windows 7, which include naming your computer and setting up an initial user account. You can use the same names that you used in Windows XP, or choose new ones.
You will now need to copy back over all the files you backed up, and reinstall all your XP software packages. For more, visit our Windows XP migration hub."

Follow these procedure for installation of Windows 7 on an XP machine.

 

[TTuT6yJI]

"With your computer on and Windows XP running, insert the disc into your computer. Setup should start automatically. If it doesn't, click Start, click My Computer, open the Windows 7 installation disc on your DVD drive, and then double-click setup.exe.
If you've downloaded Windows 7 rather than buying a DVD, browse to the installation file you downloaded, and then double-click it (often identified as an Application file under the Type column).
If you've created a bootable Windows 7 installation USB thumb drive, insert the drive into your computer. Setup should start automatically. If it doesn't, click the Start button, click Computer, double-click the drive, and then double-click setup.exe.
On the Install Windows page, click Install now. On the Get important updates for installation page, get the latest updates to help ensure a successful installation, and to help protect your computer against security threats. Now click I accept the licence terms, and then click Next.
Now on the Which type of installation do you want? page, click Custom. Choose the partition containing Windows XP (this is often the computer's C: drive), and then click Next.
In the Windows.old dialog box, click ok. Follow the instructions to finish installing Windows 7, which include naming your computer and setting up an initial user account. You can use the same names that you used in Windows XP, or choose new ones.
You will now need to copy back over all the files you backed up, and reinstall all your XP software packages. For more, visit our Windows XP migration hub."

Follow these procedure for installation of Windows 7 on an XP machine.

man you just told me how to instal windows7...but i told you that the instalation dosent go on when i restart my pc...i know how to instal i just need to get the instalation start

 

[TTuT6yJI]

I tried to run the instalation while the windows xp is running (afther the pc started working) from driver D.
it started instaling till it showed me this screen:
"Windows could not prepare the computer to boot into the next phase of installation. To install Windows reset the installation

 

[TTuT6yJI]

"With your computer on and Windows XP running, insert the disc into your computer. Setup should start automatically. If it doesn't, click Start, click My Computer, open the Windows 7 installation disc on your DVD drive, and then double-click setup.exe.
If you've downloaded Windows 7 rather than buying a DVD, browse to the installation file you downloaded, and then double-click it (often identified as an Application file under the Type column).
If you've created a bootable Windows 7 installation USB thumb drive, insert the drive into your computer. Setup should start automatically. If it doesn't, click the Start button, click Computer, double-click the drive, and then double-click setup.exe.
On the Install Windows page, click Install now. On the Get important updates for installation page, get the latest updates to help ensure a successful installation, and to help protect your computer against security threats. Now click I accept the licence terms, and then click Next.
Now on the Which type of installation do you want? page, click Custom. Choose the partition containing Windows XP (this is often the computer's C: drive), and then click Next.
In the Windows.old dialog box, click ok. Follow the instructions to finish installing Windows 7, which include naming your computer and setting up an initial user account. You can use the same names that you used in Windows XP, or choose new ones.
You will now need to copy back over all the files you backed up, and reinstall all your XP software packages. For more, visit our Windows XP migration hub."

Follow these procedure for installation of Windows 7 on an XP machine.

I tried to run the instalation while the windows xp is running (afther the pc started working) from driver D.
it started instaling till it showed me this screen:
"Windows could not prepare the computer to boot into the next phase of installation. To install Windows reset the installation