Microsoft Store blocked 

0x800704EC

Try to enable Microsoft Store using Group Policy Editor:

gpedit.msc

 Navigate to the following path on its left sidebar.

Computer Configuration\Administrative Templates\Windows Components\Store

locate the policy Turn off the Store application. Put right click on it and select Edit.
If the setting is “Enabled“, then modify its feature to either Not Configured or Disabled. Finally, make a hit on the Apply as well OK buttons to confirm changes.

Re-register Store through PowerShell
Re-registering the Microsoft Store will most probably resolve Error Code 0x800704EC Microsoft Store is blocked

This workaround with PowerShell cmdlet is the next:

Get-AppXPackage -Name Microsoft.WindowsStore | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml” -Verbose}

or

Windows 7 - drag and drop / copy and past don't/doesn't work

1)  Find an affected icon.(any in explorer or even in desktop)
2)  Click and HOLD the icon with the Left mouse button.
3)  Press Esc while holding the Left mouse button.

Drag and Drop Not Working in Windows 7

Go to Windows Explorer and click any file with any mouse button and keep the button held down for a few seconds.

Then press the Escape key. 

Drag and drop re-enabled. 
Is the miracle of Microsoft! :)

SQL join easy explanation . Left VS Rigth VS Inner VS Outter VS FULL

Winsock Event viewer tracing

Using Event Viewer to Start Winsock Network Event Tracing

When you open Event Viewer, the left pane contains the list of events. Open Applications and Services Logs and navigate to Microsoft\Windows\Winsock Network Event as the source and select Operational.

In the Action pane, select Log Properties and check the Enable Logging check box. Once logging is enabled, you can also change the size of the log file if this is needed.

Winsock network event tracing is now enabled and all you need to do is hit the Refresh action to update the list of events that have been logged. To stop logging, simply uncheck the same radio button.

You may need to increase the log size depending on how many events you want to see. One drawback to using the Event Viewer for Winsock tracing is that it does not load all the string resources so the messages displayed in the Description field (once you select an event) is sometimes hard to read (an argument that should be formatted as hex will be displayed in decimal, for example). However, you can select the Details tab in the event description which shows the raw XML log entry which usually has easier to understand arguments.

Using Event Viewer to Start Winsock Catalog Change Tracing

When you open Event Viewer, the left pane contains the list of events. Open Applications and Services Logs and navigate to Microsoft\Windows\Winsock Catalog Change as the source and select Operational.

In the Action pane, select Log Properties and check the Enable Logging check box. Once logging is enabled, you can also change the size of the log file if this is needed.

Winsock catalog change tracing is now enabled and all you need to do is hit the Refresh action to update the list of events that have been logged. To stop logging, simply uncheck the same radio button.

You may need to increase the log size depending on how many events you want to see. One drawback to using the Event Viewer for Winsock tracing is that it does not load all the string resources so the messages displayed in the Description field (once you select an event) is sometimes hard to read (an argument that should be formatted as hex will be displayed in decimal, for example). However, you can select the Details tab in the event description which shows the raw XML log entry which usually has easier to understand arguments.

http://msdn.microsoft.com/en-us/library/windows/desktop/bb892100(v=vs.85).aspx

http://msdn.microsoft.com/en-us/library/windows/desktop/hh437269(v=vs.85).aspx