Q: cannot connect itunes store and update iOS 8

Hi

This is my problem

1) iTunes could not connect to the itune store. An unknown error occurred (0x80090318)

make sure your network connection is active and try again

and

2) The iPhone software update server could not be contacted.

Make sure your network setting are correct and you network connection is active, or try again later.

P/S : I using windows 8.1 64bit