I have fixed this issue hundreds of times in XP Home by doing what I suggested.
If XP Pro has the system file in the \windows\repair folder it should work as well.
See if the system file is in the \windows\repair folder while in the recovery console.
If it is then In Recovery Console, change to the c:\Windows folder.
Type cd system32\config , and then press ENTER.
Type dir system , and then press ENTER.
If you cannot run the preceding command successfully (because the file is missing), skip to next step. If you can run the preceding command successfully, type ren system system.bak , and then press ENTER.
NOTE : If the message that you received referred to the software file, replace "system" with "software" in the preceding command. For example, you would type ren software software.bak (instead of ren system system.bak ), and then press ENTER.
Type copy c:\windows\repair\system , and then press ENTER.
Simple as that, problem solved.