Erwin06 :
I did not upgrade from windows 8.1..got it and installed it from my usb 😛
"I did not upgrade from windows 8.1"
Unless you purchased and installed your own Win 10, yes, you did upgrade from your previous Win 8.1
Is your OS activated properly?
For your error:
http://answers.microsoft.com/en-us/windows/forum/windows8_1-windows_store/error-code-0x80072efd-in-windows-81-store/80318c03-6316-4096-b651-6a29c85a094d?auth=1
The common two causes of this issue can be:
a. Microsoft Account has not been verified yet on your computer.
b. Date and time on your computer is set incorrectly.