text: win xp prof 1st install. after reboot i see a blue screen. ( on hdd sata2 wd 250  gb ) please help! error code socket am2 , motherboard asus m2n-e , proc. ath64 3800 , hdd wd 250 gb sata 2 . eror code : c0000221 unknown hard error&#92;systemroot&#92;system32&#92;ntdll.dll some file has been corrupted in the install of windows.  i would try reformatting the drive, then installing windows again and see if this time it copies the files correctly.  if that doesn't work then you've got some hardware installed incorrectly.