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If needing to access the registry database on a system that is no longer bootable, then one should use Windows PE or a Linux Live CD.

With REGEDT32 one can load and edit offline registry databases:
1.Start REGEDT32
2.Highlight the HKEY_LOCAL_MACHINE-window and select the root of the tree
3.In the menu select "Registry" -> "Load Hive"
4.Select the wanted registry database file:
◦[HKEY_LOCAL_MACHINE \SYSTEM] (%windir%/system32/config/system)
◦[HKEY_LOCAL_MACHINE \SOFTWARE] (%windir%/system32/config/software)
◦[HKEY_USERS \.Default] (%windir%/system32/config/default)
◦[HKEY_CURRENT_USER] (%userprofile%/ntuser.dat)
5.When prompted for a name give it whatever name you like (etc. test1). The name will be used to create a new node in the tree so one can browse the offline registry.
6.Go to the newly created node and edit whatever you like (The changes are written immediately to the offline registry database). One can import/export between the newly created node and the current registry just browse between the corresponding keys.
◦To export a single key(with subkeys) into a file: Select the wanted key and in the menu "Registry" use "Save Key".
◦To import a single key or tree from a file: Select the location where the key should be imported and in the menu "Registry" use "Restore". Be very careful to select the same location from which is was exported as the restore will erase everything below the import location and replace with the contents of the file.
7.When finished editing select the newly created node and in the menu select "Registry" -> "Unload Hive"
This gives some possibilities:
•Load another users HKEY_CURRENT_USER (ntuser.dat) and change the users settings without logging in with the user.
•Load an offline registry database and extract settings to import in the current registry database.
•Load an offline [HKEY_USERS \.Default] and change the login screensaver to Reset Administrator Password
•Load and edit the registry database on a parallel installation without needing to boot it first.
•Repair the registry without using a parallel installation:
◦Use the Recovery Console to recover from faulty registry
◦Boot Windows in safemode using the restored registry database
◦Start REGEDT32 and load the faulty registry and edit away the faults
◦Boot into the Recovery Console again to exchange the now hopefully fixed registry database back (winnt/system32/config)
◦Boot Windows and it will now be using the fixed registry database
Note WinXP has a new feature called Registry Repair and Recovery (MS KB Q815011) and it is usually activated when starting WinXP. But it is also activated when loading an offline hive, which can have the undesired effect that the loaded hive is modifying behind your back. One can disable this feature in WinXP SP1 in case one is afraid that the "Repair" feature will do more harm than good:
[HKEY_LOCAL_MACHINE\ System \CurrentControlSet \Control \Session Manager \Configuration Manager]
SelfHealingEnabled = 0
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Frequently Asked Questions (F.A.Q.)
( http://www.duplexsecure.com/en/faq )



Q: I see that my software application is using SCSI Pass Through Direct (SPTD) layer. What is this for? Can my software application work without it?

A: SPTD is a new method of access to storage devices that was developed by Duplex Secure Ltd.

Basically SPTD is similar to other access layers used by other programs (eg. ASPI from Adaptec, or standard SPTI from Microsoft) who provide access to storage devices but it has a lot more features that make this interface unique.

The key feature of SPTD is its ability to provide direct control of devices without risk of compromising it by some malicious 3rd party filter drivers or other "rootkit" applications that are common today - this is the main goal of SPTD development for organizations and applications where it currently used.

If SPTD is bundled with your application then most likely it will not work without SPTD (Please consult manufacturer of application for more detailed information).

SPTD is currently supported only on Microsoft OS Windows 2000 and above. SPTD (similar to other access layers) is by default not removed from your system after uninstallation of software application which used SPTD, in order not to disrupt other applications that may use it! This also allows user to avoid reboots in most cases for new installations if same SPTD version is already present on his system.



Q: How can I disable SPTD on my computer to check if it causes problems?

A: If your system has some problems with SPTD installation you can do as follows:

If your system is already running then go to step 2 directly. Otherwise start from step 1.

Step 1. Boot in safe mode and press ESC key when you see on bottom line of display: "Press ESC to cancel loading SPTD.sys". This will abort loading of SPTD layer.
Step 2. Find "HKEY_LOCAL_MACHINE\System\CurrentControlSet\ Services\sptd" registry key in REGEDIT and set DWORD Start value to 4 (i.e. disabled).
Step 3. Reboot again in normal mode and check if your issue is solved.

To reenable SPTD restore the DWORD Start value back to '0' and reboot your computer.



Q: How can I remove SPTD driver on 32-bit OS?

A: To remove SPTD, simply download SPTD setup file "SPTDinst-v172-x86.exe" for Windows 2000/XP/2003/Vista (32-bit) [610,800 bytes] and execute it.

In dialog that appears press "Uninstall" button and then SPTD will remove itself from your Windows installation.

If you want to install it again then execute the same setup file and press "Install".



Q: How can I remove SPTD driver on 64-bit OS?

A: To remove SPTD, simply download SPTD setup file "SPTDinst-v172-x64.exe" for Windows XP/2003/Vista (64-bit) [689,648 bytes] and execute it.

In dialog that appears press "Uninstall" button and then SPTD will remove itself from your Windows installation.

If you want to install it again then execute same setup and press "Install".



Q: When I install my software application, at the very beginning it tells me to install SPTD Software. Then I selected yes but then there is a popup a window and it says that "Failed to open config key". What is the possible solution?

A: A possible reason for this message might be an antivirus software installed on your PC. Please try to remove SPTD when it is already installed, then reboot in safe mode. Disable antivirus during this installation and then run again software application setup.

If problem is not resolved you may try to remove SPTD and then reboot in safe mode. Disable antivirus and run standalone sptd.sys installer taken from "Downloads" section (x86 or x64 version depending on your OS). Reboot your PC in normal mode and please run again software application setup.



Q: Does SPTD have a silent option on the command line?

A: SPTD now supports silent installation. It is possible to install SPTD silently in this way using a command line:

"SPTDinst-v172-x86.exe add /q"

or:

"SPTDinst-v172-x64.exe add /q"

depending on your OS.





Note: Beginning from version 1.38 SPTD will not display debugger warning dialog anymore. This info left in EULA only as this message confuses many users and also not "silent setup friendly".



Standalone SPTD installer is released by Duplex Secure officially and can be obtained at: DuplexSecure.com or at Disc-Tools.com



Q: Is it recommended to create a new System Restore point before installing SPTD?

A: Beginning from version 1.42 SPTD will automatically create a new System Restore point right before installation of SPTD, so in case of possible problems with your OS you can always return to this restore point.



Note: SPTD will automaticaly create a new System Restore point ONLY if System Restore functionality is enabled in your OS.