Hello: I cannot start window ,have a message : windows\system32\config\system corrupt because some software problem....please repair it,etc..... then try to start bartpe cd,load erunt exe ,restore the backup of yesterday copy,this backup locate in window drive ,and I can access it .but I also want to backup it when restoring,but when backup erunt said cannot backup ,do you want to continue restore ?yes,I press "yes" to continue. then it said complete restored,reboot computer ,it now said missing system 32\hal.dll,cannot boot ,then I try to use bartpe to see what happen. now I load bartpe, when I go to window directory it say:" it's 'not formatted, would you like to format now"but only window directory have this problem program and document directory (my window xp) have no this problem,I can access program files and documents from it. I have some partition software,but what can I do,do I restore mbr ,boot sector,or restore the partition table?(I have backup them in april,2008 ) I do not know what the problems is the target?! wait for some one help,thanks very much I have not install any new software or do anything before the computer cannot start,I can still used it last night without problem.