Hi Ashish,
Could you please provide us the event viewer logs to find the exact cause and to troubleshoot the issue further.
NOTE: Try to access Windows Explorer, so that event viewer record the logs.
Event Viewer is a tool that displays detailed information about significant events (for example, programs that don't start as expected or updates that are downloaded automatically) on your computer. Event Viewer can be helpful when troubleshooting
problems and errors with Windows and other programs.
- Press the Windows key and X and select Event Viewer.
- This will bring up the Event Viewer box. Click to open the event viewer.
- In the left pane, expand out Windows Logs.
- Most of your event will be Information. You may see Yellow Warnings or Red Errors.
For more information refer to the following link:
**http://windows.microsoft.com/en-in/windows7/what-information-appears-in-event-logs-event-viewer**
Note: Also applies for Windows 8.
Provide us the logs to assist you further.