Win8.1 app store can't download error code 80070057 What to do?

Method 1: Use the store store troubleshooting
1, download the app store troubleshooting tool;
2, run, the software will automatically detect possible problems and fix.

Method 2, clean up the cache
1, press the Windows+R key to enter “services.msc”, enter the "services" window;
2, close the Windows Update service;
3, find the Softwaredistribution folder according to the address, C:windowsSoftwareDistribution;
4, rename the folder, such as SoftwareDistribution1;
5, re-open the Windows Update service, the system will regenerate the SoftwareDistribution folder.
Method 3, manually set DNS
1, right click the network connection icon, select “Open Network and Sharing Center>;
2, click the network name of the current connection, open the network status window, click “ Attributes 
3. Double-click "Internet Protocol Version 4" in the Network Properties window, and manually set the DNS server to “4 2 2 2“ and "4 2 2 1“, and then try again.