ERUNT is a registry backup and restore program for Windows. You can backup the registry to a folder of your choice. System and current user registries selectable. Command line switches for automated registry backup and restoration. Restore the registry in Windows and MS-DOS. Included in the package: NTREGOPT program for optimizing the registry.
Reviewing 1.1j (Oct 8, 2013)
if you are running your windows PC without this program you are NUTS! My butt was just saved because I had installed it on a friends PC which shortly afterward (days) suffered a catastrophic failure where it would not boot. Using the Windows CD I was able to finally get to the ERDNT folder and restore the registry to a known working condition. It was my final attempt after about 5 hours of trying to achieve some sort of progress on a PC that appeared to be suffering from some inexplicable Hard Drive failure. However the hard drive when placed in another PC was producing no symptoms of problems. God Bless the Writer of this software. It is OUTSTANDING!!!!
Reviewing 1.1j (May 29, 2013)
Fabulous program. Saved me from the fbi virus and have used other times when registry corrupted. If your laptop will not load, easy solution if you have another computer is to place the hard drive in a usb case and connect to working computer. Modify inf file for the backup you want to use to change the drive letter to the drive letter your hard disk in the case is showing and then click on the backup. Have not tried yet on windows 7, but great for xp
Reviewing 1.1j (Aug 13, 2012)
To get the daily Registry backups in Windows 7/Vista without completely turning off MS's UAC, run TweakUAC v1.0. Select 'Quiet Mode'. Now eruNT runs as it did on prior MS Windows versions.
Be careful about directing your Registry backups to a drive other than C:. You won't be able to see them, nor run erdNT from outside of Windows, if you have to use the Recovery Console.
Reviewing 1.1j (Apr 25, 2012)
I have used ERUNT since many years, mainly with Windows XP. It is definitely one of the best tools you can find! Now I am using Windows 7 and am a bit concerned that it could cause some complications. The reason is the statement in the FAQ on the website: “Also, a problem has been discovered which on many systems causes ERDNT and NTREGOPT to display a ‘RegSaveKey: 3’ error when optimizing / restoring the BCD00000000 hive. The cause is that after a clean install of Windows 7, the BCD part of the registry which contains Windows’ boot configuration data, resides on a hidden system partition with no drive letter assigned in Explorer. You can simply ignore this error and continue, or as a workaround, open Disk Managemant in Control Panel and right-click on the partition displayed as ‘System Reserved’ to assign a drive letter.”
I only find two “Healthy Primary Partitions” (one big and one small) that have no drive letters at all, and I cannot assign a drive letter to any of them. “Change Drive Letter…” is grayed out. Maybe things are different in Windows 7 Ultimate, or maybe they changed with SP1 or some update.
So I am strongly hoping and eagerly waiting for a new version that is completely compatible with Windows 7, without any potentially scary little problems! It seems to have been announced for quite some time now…
In my Windows 7 Ultimate I can go to Control Panel > Administrative Tools > Computer Manage-ment > Disk Management – I don’t see a more direct way… – and there I cannot find any “System Reserved” anywhere. So what can I do?
Is there any risk involved with assigning a drive letter to it, once I have found it? What can in the worst case happen if I simply ignore the error, as mentioned above? And what do ERUNT and ERDNT do once I have found “System Reserved” and given it a drive letter? And also: How does Windows 7 Ultimate react if I give it a drive letter?
I have the feeling that these points do need some clarification.
Reviewing 1.1j (Mar 12, 2012)
Just unzipped it, configured it, and ran it in Win7-64 Pro. For safety, I decided not to use the install file, just the ZIP'd file. Because I have been using computers since the Apple II+ days, before MS-DOS was even written, configuration was straightforward, simple, and easy. For these small but essential utilities, I prefer not using an installer anyway. The default folder for AUTOBACKing the Registry is:
As someone mentioned before, when AUTOBACK is launched in the StartUp folder, this will not work in Win7. The explanation is in ERUNT_Tweaks_Win7.txt. I decided to just use an AUTOBACK Desktop icon with a CTRL+SHIFT+ALT+A shortcut key. This way I can do a quick backup anytime I want. The ERUNT README.XT file states the backup will take "some time." I found this humorous because on my i7, SATA system, it took 2½ seconds. The Win7 Registry is quite bloaty at 168 MB's.
If you have a second drive or partition, I highly recommend you do NOT create your backups on the C: partition. If you get a BSOD, you can get file corruption. Save your backups on a different partition. Because another reviewer complained how long it took to create the command line, here is what I decided to place on the shortcut:
Target: "C:\Program Files (x86)\ERUNT\AUTOBACK.EXE" D:\ERDNT\#DATE#-#TIME# sysreg curuser otherusers /noconfirmdelete /days:14
Start in: "C:\Program Files (x86)\ERUNT"
Shortcut key: CTRL+SHIFT+ALT+A
You must create and place the above shortcut on your DeskTop for the Shortcut key combination to work correctly. This will give you 14 days of backups. To avoid any conflicts should you do multiple backups on the same day, I have added the time to the folder name.
Be aware, ERUNT v1.1j was written in 2005, 4 years BEFORE Win7 was released. Therefore, I do not recommend you use the included NTREGOPT utility. Other reviewers have complained they've had problems with NTREGOPT.
The restore utility is called ERDNT. Since I just started using ERUNT, I have not yet had cause to use ERDNT. Hopefully, I won't but it's good to know I have a backed up Registry.
To check which User accounts are included in the backup open the file ERDNT.INF - the restore paths for the numbered User folders are listed at the end of this file.
To get ERUNT working correctly under Vista or Win7 see my install notes here:
I installed and ran erunt for the first time. This looks like a great program; however, the question I have is: After doing the backup, I went to the users folder in the backup destination and noticed that the users are numbered. How does one know which user is which? I would like to be sure that a particular user is backed up. Any suggestions would be appreciated. Thanks, Joe.