I have a Dell Dimension 4700, 2560 RAM, 160GB HD OS-WIN XP Home.
Recently got the Blue SOD screen on Booting up. I used the Dell diagnostics CD to do tests, & it listed 2 errors relating to th HD. I suspected a HD failure, as it is over 5yrs old. I bought a simmilar replacement - a Seagate Barracuda 7200-12, 500GB. Now when i try to re-install Win XP it starts of OK, but when it reaches the point where the T&C acceptance should appear, I get this erroe -STOP C0000221 Windows unknown hard error/system root/system32/NTDLL.LL. I have attempted loading WINS with an alternat CD, but I get a simmilar reaction, it gets to the FORMAT stage & then just stops without any errors.