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Sounds like you only have the same name, not the same SID anymore.. run as domain admin takeown and set the user as owner for folders and files.
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Hi ste5an,<br />
<br />
Already see the user as the owner, and even granted this user with full control on all files and folders.
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This given suggest works perfectly
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This is using a Windows 7 desktop. I just join this desktop to a MS Windows 2008 AD domain, and the user profile migrated as well. The user is the original user, so this user profile was in C:\Users\Tait123, and now this profile is used by a domain user named JF\andre.tait. There are about 600 GB files and folders within this profile.<br />
<br />
The user can log on to the desktop without problem. However, when he double-click to open any folder/file (or shortcut) on the desktop, the following error message prompts:<br />
<br />
&nbsp; &nbsp; Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item.<br />
<br />
However, the user was given the &quot;full control&quot; of all the files and folders. What went wrong? <br />
<br />
Thanks in advance.
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This is using a Windows 7 desktop. I just join this desktop to a MS Windows 2008 AD domain, and the user profile migrated as well. The user is the original user, so this user profile was in C:\Users\Tait123, and now this profile is used by a domain user named JF\andre.tait. There are about 600 GB files and folders within this profile.

The user can log on to the desktop without problem. However, when he double-click to open any folder/file (or shortcut) on the desktop, the following error message prompts:

    Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item.

However, the user was given the "full control" of all the files and folders. What went wrong? 

Thanks in advance.

Why file permissions issue?

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.

Windows OS

Windows 7 is an operating system from Microsoft. Features include multi-touch support, a redesigned Windows Shell with a new taskbar, referred to as the Superbar, a home networking system called HomeGroup, and performance improvements.

Windows 7

A desktop computer is a personal computer designed for use at a single location due to its size and power requirements, usually by one person. The most common configuration has a case that houses the power supply, motherboard, disk storage (usually one or more hard disk drives and optical disc drives); a keyboard and mouse for input; and computer monitor and printer for output. The case may be oriented horizontally and placed atop a desk or vertically and placed underneath or beside a desk.