Common Start Up Problems and solutions of Windows OS

NTLDR or NTDETECT.COM Not Found

If you get an error that NTLDR is not found during bootup,

If you have FAT32 partitions, it is much simpler than with NTFS.
Just boot with a Win98 floppy and copy the NTLDR or NTDETECT.COM files
from the i386 directory to the root of the C:\ drive.

For NTFS:
Insert and boot from your WindowsXP/7  CD.
At the first R=Repair option, press the R key
Press the number that corresponds to the correct location for the installation of Windows you want to repair.
Typically this will be #1
Enter in the administrator password when requested
Enter in the following commands (X: is replaced by the actual drive letter that is assigned to the CD ROM drive.
COPY X:\i386\NTLDR C\:
COPY X:\i386\NTDETECT.COM C:\

Take out the CD ROM and type exit ....

Corrupted or Missing \WINDOWS\SYSTEM32\CONFIG

If you get the error:

Windows could not start because the following files is missing or corrupt
\WINDOWS\SYSTEM32\CONFIG\SYSTEM or \WINDOWS\SYSTEM32\CONFIG\SOFTWARE

Insert and boot from your WindowsXP/7 CD.
At the first R=Repair option, press the R key
Press the number that corresponds to the correct location for the installation of Windows you want to repair.
Typically this will be #1
Enter in the administrator password when requested.
cd \windows\system32\config
Depending on which section was corrupted:
ren software software.bad or ren system system.bad
Depending on which section was corrupted
copy \windows\repair\system
copy \windows\repair\software
Take out the CD ROM and type exit....

HAL.DLL Missing or Corrupt 

If you get an error regarding a missing or corrupt hal.dll file, it might simply be the BOOT.INI file on the root of the C: drive that is misconfigured

Insert and boot from your WindowsXP/7  CD.
At the first R=Repair option, press the R key
Press the number that corresponds to the correct location for the installation of Windows you want to repair.
Typically this will be #1
Type bootcfg /list to show the current entries in the BOOT.INI file
Type bootcfg /rebuild to repair it
Take out the CD ROM and type exit...

NTOSKRNL Missing or Corrupt in Windows XP 

If you get an error that NTOSKRNL not found:

Insert and boot from your WindowsXP/7 CD.
At the first R=Repair option, press the R key
Press the number that corresponds to the correct location for the installation of Windows you want to repair.
Typically this will be #1
Change to the drive that has the CD ROM.
CD i386
expand ntkrnlmp.ex_ C:\Windows\System32\ntoskrnl.exe
If WindowsXP is installed in a different location, just make the necessary change to C:\Windows
Take out the CD ROM and type exit....