You have a computer that is running Windows RT 8.1 or Windows 8.1.
Your account is not connected to a Microsoft Account (MSA).
The computer has Microsoft Office 2013 Service Pack 1 (SP1) preinstalled, or you have previously connected your account to a MSA and have since disconnected from it.
In this scenario, after the computer restarts and you log on, upon opening File Explorer for the first time, it freezes for 30 seconds.
If there is a C:\users\<Username>\OneDrive folder, Explorer tries to check the MSA information. However, if your account is not connected to a MSA, the SkyDriveShell.dll module freezes for 30 seconds during the initialization.
Note As soon as you connect your account to a MSA, the C:\Users\<Username>\Onedrive folder is created. Preinstalled Microsoft Office 2013 Service Pack 1 also creates the C:\Users\<Username>\Onedrive folder.
To resolve this issue, install update rollup 2962409. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2962409 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: June 2014
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates