The solution is to delete the iTunesPrefs.xml file from your computer.

The path of this file in Win7 is c: \ users \ xxxx \ appdata \ roaming \ applecomputer \ itunes \

The path of this file in Winxp is C: \ Documents and Settings \ XXXX \ Application Data \ Apple Computer \ iTunes \

XXXX is the computer user name or the default administrator.

After deleting the file, run iTunes again and you will be prompted to reconfigure it. When finished, iTunes will return to normal. You can iTunes store(iTunes Store smoothly.

The App Store error code in macbook is-100 1.

Solution: This code is caused by a network problem. The landlord can try to see if there is a network cable connection. If it can be connected, it is a WIF problem. Restart the wireless router and check whether there is any problem with the settings. If DNS is wrong, all web pages can't be opened.