CyberNotes
Time Saving Tuesday

I’m sure many of you have seen the Last Known Good Configuration option at some point or another when starting Windows, but do you actually know what it does? It says that it will use “your most recent settings that worked,” but that could mean a variety of things.

Then there is the Windows System Restore, which by the name would almost make people assume it does something similar to the Last Known Good Configuration, but in reality they are pretty different. Lets see how the two of them differ, and when you would want to use each of them.

–Last Known Good Configuration–

Each time you successfully startup your computer, Windows saves any system-related settings to the Windows Registry. Some of the information that is written to the Registry is in regards to device drivers and services that are used by Windows.

When you choose to use the Last Known Good Configuration mode all of the settings contained within the HKLM\System\CurrentControlSet Registry key will be restored to the last state when you’re computer booted up successfully. This will not modify any files, but it will be able to point the system back to older drivers, assuming that they are still accessible on the machine.

Using the Last Known Good Configuration…

  1. Start your computer.
  2. When you see the “Please select the operating system to start” message, press the F8 key.
  3. When the Windows Advanced Options menu appears, use the ARROW keys to select Last Known Good Configuration (your most recent settings that worked), and then press ENTER.

Last Known Good Configuration

Use Last Known Good Configuration if…

  • The last time you started Windows you didn’t have any issues.
  • You install a new device driver, restart Windows, and the computer will no longer boot. By reverting back to the Last Known Good Configuration you will restore the settings so that they point back to the old driver.
  • You disable a driver that turns out to be more critical to the operation of Windows. By reverting back to the Last Known Good Configuration you will restore the settings back to when the driver was still enabled.

DON’T Use Last Known Good Configuration if…

  • Windows won’t boot because you deleted some system files.
  • You copy a new driver over top of an old one. Switching to the last known good control set will not undo anything since the configuration never changed.
  • Windows boots up, a user logs in, and then Windows freezes. By this point it is too late because Windows has already written over the Last Known Good Configuration backup.

–System Restore–

System Restore was haphazardly introduced back in Windows Millennium Edition, but wasn’t actually found to be useful until Windows XP was released. It’s progressively gotten better as more versions of Windows have been released, and in Vista it includes some new features.

Restore points (a.k.a. checkpoints) are, by default, created every 24 hours or when the user manually creates them. Aside from that restore points are also automatically created when some applications are installed, Windows Updates are installed, or non-signed drivers are installed.

System Restore is very selective in what it backs up. It keeps track of changed system files (extensions: EXE, BAT, DLL, etc…), Windows Registry, drivers, and more. It never touches file formats related to things like documents, email, music, and a few others that aren’t critical to the system’s operability. It will also ignore things placed in “My Documents” giving you a little reassurance that you won’t wipe out your documents during a restoration.

CAUTION: It’s important to know that all programs installed after the selected restore point will be uninstalled when rolling back your system using System Restore.

Using System Restore…

  1. Open System Restore by clicking the Start button, clicking All Programs, clicking Accessories, clicking System Tools, and then clicking System Restore.
  2. Choose a restore point and proceed through the wizard.

System Restore

One of the nice things about System Restore is that a checkpoint is also created before you proceed with the restoration. If using a restore point didn’t help you’ll always be able to jump back.

Use System Restore if…

  • Problems started to occur after you installed an application, Windows Update, or a driver.
  • You accidentally removed or modified an important system file that is causing the system not to function properly.

DON’T Use System Restore if…

  • You have installed an application since the selected restore point, and you’re afraid of losing the application itself.
  • You have important files placed throughout your computer, and you’re not sure if System Restore will ignore them. Place all of your personal files into the “My Documents” folder to ensure that they are protected.

There Are 17 Comments

  1. Well System Restore is the biggest piece of crap and waste of hard drive space, because IT never works in XP. You can never EVER restore, even if you disable, then re-enable and create a restore point, no matter how many or how little restore points you have you can never restore, it’s the biggest piece of crap Microsoft ever developed, at least they got it right (so the rumor says) in Vista. If anything that’s probably one of the only benefits to vista over XP.

    • Andrew, re “it never works in XP,” it has for me, at least twice that I remember on my home computer.

      Just saying.

  2. System Restore in Vista saved me a couple months back–I was shocked that it actually worked, really. Some critical files were altered when I updated my Nvidia Driver AND installed a couple Vista hotfixes that prevented my computer from accessing any internet functions and caused massive instability. I restored to 2 days previous and have been fine (fingers crossed) ever since. Weird.

  3. Heh, system restore never acctually did anything on my XP machine. Haven’t used it in Vista yet though…

  4. @Andrew:

    My experience with System Restore using Windows XP has been excellent. I remember at least two occasions when I downloaded an application and the whole system went crazy. I went back and restored my system to a previous date and everything worked well.

    I downloaded and installed the culprit software and I was back in business. Without System Restore I don’t know what I would have done besides pulling my hair and screaming for Help!

    Just my two cents on the subject.

  5. WHAT… where did my comment go… gosh Cybernet has some serious issues with comments!

  6. @Ryan:

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    Firefox 2.0.0.11 fixed a bug introduced by the 2.0.0.10 update in the (canvas) feature that affected some web pages and extensions.

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  7. Great comparison between the two. Stumbled :D

  8. Andrew wrote:
    WHAT… where did my comment go… gosh Cybernet has some serious issues with comments!

    Your comment is the very first one – is there another one that’s missing?

  9. I dont remember system restore ever working for me….

  10. Andrew wrote:
    Well System Restore is the biggest piece of crap and waste of hard drive space, because IT never works in XP.

    I had used it in XP, and I know it saved me once or twice in all the years I was using it. So I wouldn’t say it is completely worthless, but yes, it is way better in Vista particularly because you can run System Restore from the Vista installation DVD.

    Brown Baron wrote:
    Great comparison between the two. Stumbled :D

    Thanks! We always enjoy the support of our readers!

  11. lol Andrew. System restore works just fine in Vista and in XP, I imagine you were probably doing something wrong, although they do have a wizard for just about everything, virtually removing user error, granted this was like 2 years ago so who knows. Maybe windows XP didnt want you to restore, that makes more sense to me than Microsoft making a p.o.s. utility that does not work.

  12. Anonymous people that yap about backwards facts are a waste of bits.

  13. XP restore does not work with my company’s required PGP software encription on the frontend and blocks backup also.

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