Computer hangs on reboot after instalation

Hi I have Win XP installed on my PC and I have tried several times to do a dual boot with Win7 RC and after each attempt I have put my system back to normal by reformatting the Win7 partition with Acronis Disk doctor and reimaging XP Pro with Acronis true Image.

What happens is I go through the install and the green progress bar goes pretty well right across the screen and all the stages are checked of as they are done then I get the screen that the computer wants to reboot and I let it time out and when it starts up again I get "Press any key to boot from CD or DVD" the first time I left it because I didn't want to reinstall again after some time with the PC still at that screen I pressed a key and nothing happened.
Another time I pressed the key and it wanted to do another installation so I let it do a repair and when it rebooted the same thing so I tried again and removed the disk when it rebooted and when the PC gets through POST I get a black screen with a blinking cursor that I cant type anything to.

I would imagine that if I can get past this point it would be where I type in the product key.

I have tried this disk on another computer in Ubuntu with virtual box and it installed ok. I have the boot order correct I have recently installed XP pro on it. I am using a PS2 keyboard that was OK for the XP install and I can get into Bios OK.

I would appreciate any input that anyone can give thanks in advance.

I Just tried again with only one stick of RAM and its the same actually the green line isn't all the way across but every thing on the list is checked off and it is a proper reboot but It won't go past the DVD I will reformat the Win7 partition and reimage XP back because I cant use this PC as it is. I hope someone can shed some light on this.

EDIT: I will put the RAM back

Thanks nate42nd I have tried removing the disk and I get a black screen with a flashing - but I cant type anything there. Hopefully the device manager trick for old hardware will do the trick but its late here now so I will try it tomorrow, thanks again