Located in %WINDIR%/System32, Slui.exe (Windows Customer Activation) is a vital file for the process of ENABLE (Windows Genuine) of operating systems Windows 7, Windows XP and Windows Vista. 
If this file is missing or cannot be accessed, it is impossible to a valid licentious on the operating system.
“Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item. “

Solving Error Slu.exe on Windows 7 / XP / Vista activation
First of all we will have to make sure that the file Slui.exe is in his place. That is in %WINDIR%/System32. If this file is missing then it is the worst scenario. Or it was sters accidental, or it was virusat and erased by antivirus. 
In this case the only option is to try a system repair (Windows Repair) using CD/installation DVD. If this method does not bear fruit, we recommend reinstalling the operating system.
If the file of slu.exe is in its place, but it is not possible to activate the operating system, it means that the system of the system from which the activation is tried, does not have the necessary privileges (permits) and the user will have to be activated Administrator.
Windows 7.
1. We open Start And we type “cmd” in search, apoi Enter to open Command Prompt.
2. In Command Prompt We type the following order line:
net user administrator /active:yes
3. We go in Start > Shut down > Switch user and we log on the account of Administrator.
From the administrator account Rulaam Slui.exe to activate the operating system.
If the above methods are not helpful, it is possible that a program firewall or anti virus to have blocked the running of this file.
Stealth Settings – SLUI.EXE Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item.
 
			