Windows could not start because the following file is missing or corrupt : SOLVED

Many time we start Windows XP & got a black screen with some error like 

Windows could not start because the following file is missing or corrupt
\WINDOWS\SYSTEM32\CONFIG\SYSTEM
\WINDOWS\SYSTEM32\CONFIG\SOFTWARE
\WINDOWS\System32\HAL.dll
\WINDOWS\System32\Ntoskrnl.exe
NTLDR IS MISSING
INVALID BOOT.INI
OR may be any other file is missing

SOLUTION
Solution is very simple
Just insert the Windows XP CD & boot the computer with it
On "Welcome to Setup" just press the R button to start Recovery Console
Select your OS (Generaly 1 if you don't have dual boot OS)
When prompted for password type Administrator password (Press enter if you didn't set any password)
At the Recovery console type these commands
C: CD ..
C: ATTRIB –H C:boot.ini
C: ATTRIB –S C:boot.ini
C: ATTRIB –R C:boot.ini
C: del boot.ini
C: BOOTCFG /Rebuild

After Rebuild type below command to fix any error with HDD
C: CHKDSK /R /F 
C: FIXBOOT
“Sure you want to write a new boot sector to the partition C: ?” press “Y”
C: EXIT
Enter

& It's Done.. Your Windows is now started

Enable Restrictions on iPhone/iPad/iPod to stop App-Purchases

You got a SMS that this amount has credited from your credit card no. in App purchase & later known that your brother/cousin or any other family member had spend money from your credit card on Apple App-store.

Solution

You need to enable Restrictions also known as Parental Controls, to stop this

Tap on Setting App
Go to General & tap on Restrictions
Enable & it will ask you to set a passcode
Just enter any passcode twice to set it (Don't share this passcode with people you don't want making in-app puchase)
Once the passcode is set, Slide the In-App Purchase slider to off

Now don't worry about misuse of your credit card. Let your cousins play games or watch movies on your IOS device

But remember don't share the restrictions password with anyone.

How to Solve “The program can’t start because MSVCR71.dll is missing” Error in SQL Developer

Oracle SQLDeveloper on Windows 7 is not working after upgrading it to 3.2. 
When I am trying to run, it shows "This application failed to start because MSVCR71.dll was not found. Re-Installing the application may fix this problem."


SOLUTION
Fixing this problem is very simple, just copy the file “sqldeveloper\jdk\jre\bin\msvcr71.dll” to folder “%WinDir%\System32\″
 Suppose the windows installed at C drive then copy the MSVCR71.dll file to "C:\Windows\System32" folder

& It start working again...:)