win8.1 Application store can not use can not complete the purchase change how to do?

In the service, Windows Update Service is turned on (set automatically).

Law II: The computer set up the "account", and then select "More Online Account", enter the password and then return.

Law III:

First step,

(1) Win+r, Input:%temp%

(2) Delete all items in the Temp folder.

Step Two,

(1) Win+r, Input: services.msc

(2) View four services:

1) Cryptographic Services Background Intelligent Transfer Service2)

3) Windows Update

4) Windows Installer

(3) Closure of the above four services;

(4) c:/windows/Delete the SoftwareDistribution folder, (5) reopen the services above four services.

Step Three,

(1) Win+r, Input: Wsreset

(2) Restart the computer.

Fourth Step,

(1) Log on to your computer using a Microsoft account.

(2) Check the update again, enter the application store, download the application.