Don't know how you are doing it but the software is normally installed first before plugging in the scanner.

Looks as if you have lost permissions to view devmngnt

Back up everything first before you:

Reset Vista default permissions, then grant permissions to your admin user account (the one you normally use OK). Try the following steps.

1. Download the subinacl.msi file to your desktop

2. On the Desktop and double click the downloaded file.

3. Select the C:\Windows\System32 folder as the Destination Folder during the installation. Later this tool is used to reset the permission settings on the current machine.

   Note: If UAC (User Account Control) window is prompted for permission to continue, please click "Continue"

4. Click "Start". In the Start Search bar, type: notepad and press Enter.

5. Copy the following commands and then paste them into the opened Notepad window:

   @echo off

   subinacl /subkeyreg HKEYLOCALMACHINE /grant=administrators=f

   subinacl /subkeyreg HKEYCURRENTUSER /grant=administrators=f

   subinacl /subkeyreg HKEYCLASSESROOT /grant=administrators=f

   subinacl /subdirectories %SystemDrive% /grant=administrators=f

   subinacl /subdirectories %windir%*.* /grant=administrators=f

   subinacl /subkeyreg HKEYLOCALMACHINE /grant=system=f

   subinacl /subkeyreg HKEYCURRENTUSER /grant=system=f

   subinacl /subkeyreg HKEYCLASSESROOT /grant=system=f

   subinacl /subdirectories %SystemDrive% /grant=system=f

   subinacl /subdirectories %windir%*.* /grant=system=f

   @Echo =========================

   @Echo Finished.

   @Echo =========================

   @pause

6. After the above commands are finished, close the Notepad window. Choose Save when you are prompted to save the file. Type "reset.bat" as the file name and choose Desktop from the left panel as the save location.

7. Refer to the Desktop and right click the reset.bat file, then choose "Run as administrator."

8. You should see a DOS-like window processing.

NOTE: It may take several minutes. When it is finished, you will be prompted with the message: "Finished, press any key to continue".

Now to reset your user permissions:- log in as your normal user

Go to start, all programs, accessories and right click on command prompt select "run as administrator" command prompt will open C:\Windows\system32> type

takeown /f C:\windows

press enter

SUCCESS: The file (or folder): "C:\windows" now owned by user your user name.

C:\Windows\system32> type

icacls c:\windows /grant your user name:f

processed file: c:\windows Successfully processed 1 files; Failed processing 0 files

C:\Windows\system32> type

takeown /f C:\

SUCCESS: The file (or folder): "C:\" now owned by user your user name"..

C:\Windows\system32> type

icacls C:\ /grant your user name.:f

processed file: C:\ Successfully processed 1 files; Failed processing 0 files

C:\Windows\system32>

Type Exit press enter RESTART computer