Installing xp pro on netbook issues...help?

I have made an xp pro installation cd using imgburn and tested it using virtualbox. it worked perfectly on virtualbox(the computer with virtualbox is windows vista 32 bit). but the netbook (which has xp on it but need to be redone) has no cd drive so i borrowed a friends external drive. the pc has the option to boot from disk and does start up windows setup. after it say windows is starting up on the bottom of the screen after the initial 5 minutes of using the disk i get the blue screen saying it has to shut down in fear of having a virus or some other bad stuff that was going on and tells me to restart. one piece of info that might cause this is I forgot to pick up the 5v power supply to the ext. cd drive from my friends. so its only connected through usb port. so my question is, is it possibly not working because it needs to have its power supply even though it seems to read the disc fine for about the first five minutes? (even the light on the ext. drive was flashing as it should) is there something else that could be causing this issue? thanks for the help and im sorry for the rough draft but im kind of in a hurry.