I'm currently using my laptop for a year and today when I opened my Dell Vostro  2420   I  get this error message.

• :(
• Your PC ran into Problem and it needs to restart. We're just collecting some error info, and then we'll restart for you.
• error. 0xc000021a

After it automatically restart it says

• RECOVERY
• Your PC couldn't start properly
• After multiple tries, the operating system on your pc failed to start, so it needs to be repaired
• Diagnosing your pc
• Automatic repair couldn't repair your pc
• press Advanced Options to try other options to repair your pc or shut down to turn off your pc.
•  Log file: C:\Windows\System32\Logfiles\Srt\SrtTrail.txt .

Whats should I do , help me please!!!