Windows 7 Boot Disc, can read from it but can't boot from it.?

I'm trying to install Windows 7 Ultimate 64 bit onto my OEM Windows XP Home 32 bit desktop in a seperate partition in a second harddrive in the computer that Windows XP was not installed on. I got the .iso image for Windows 7, and i burn it onto a DVD+R disc and made it bootable with my laptop using PowerISO. I put the disc into my desktop's dvd rw drive, set the boot order so that it boots the dvd drive first, and then let it boot. After POSTing, the flashing underscore appears, and i could see that the dvd drive is trying to read the Windows 7 boot disk, but after a few hours, nothing happened. I then booted my desktop normally and tried to see if i could access the disc, and i could.

I take the dvd and try booting it in my laptop, but the same thing: Flashing underscore for hours. I boot my laptop normally and insert the dvd in to see if it can read, and it could.

Afterwards, i burned Windows 7 onto a DVD-RW disc, made it bootable, and tried to see if it would work this time. When i inserted the dvd into the desktop, i came to a conclusion that it can't read it since it left my computer frozen until i removed the dvd. I tried to boot with it, but i was left with the flashing underscore and sounds from the dvd drive that sounds like its doing something repeatably .

I take the dvd to my laptop. It could read it, but still could not boot from it. So, i need some help to identify the problem and how to install this on my desktop.