My computer won't get past the second boot/load screen where it checks the usb slots and cd/dvd it either stops because I don't have my windows 7 disk on or because of missing ntldr. I tried use windows 7 repair for start but it didn't work I have recently installed new software but I have restarted twice after I installed it no problems. A simelar problem like this has happened to me when I was adding hardware.