Last Known Good Configuarion

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Hi friends,

Just a small scenario to understand what exactly does Last Known Good
configuration do.

A user installs an application or does a driver update or a windows update.
He then does a System restore to rollback the system to the restore point
created 2 days back. Now, if he does a Last Known Configuration, will the
recently installed application be functional or will the recently installed
driver / windows update get applied again?

Thanks a lot
Gautam
 
Looking in;
HKEY_LOCAL_MACHINE\SYSTEM\Select
you'll find the D-Word values for
"Current"=dword:00000001
"Default"=dword:00000001
"Failed"=dword:00000000
"LastKnownGood"=dword:00000002

CurrentControlSet is volatile and will always be an image (at boot) of
what's defined in ControlSetx where x = the value of "Current"

Choosing last known good boots the system with the control set that last
successfully booted your system. Control sets contain system configuration
information such as device drivers and services.


--
Regards,

Dave Patrick ....Please no email replies - reply in newsgroup.
Microsoft Certified Professional
Microsoft MVP [Windows]
http://www.microsoft.com/protect

:
| Hi friends,
|
| Just a small scenario to understand what exactly does Last Known Good
| configuration do.
|
| A user installs an application or does a driver update or a windows
update.
| He then does a System restore to rollback the system to the restore point
| created 2 days back. Now, if he does a Last Known Configuration, will the
| recently installed application be functional or will the recently
installed
| driver / windows update get applied again?
|
| Thanks a lot
| Gautam
|
 
Hello
The 'LKG' is a bit different that what you are thinking.
It is overwritten everytime you successfully logon.
So in your scenario, the user installed a driver or MS update,
rebooted, logged in [LKG overwritten at this point]
then went to rollback 2 days but the LKG is now the
one from the current logon. The LKG is still the current one if
you F8 and select it.
I think of restore points for snapshots and LKG is
for things like when installing new hardware and the system
blue screens on reboot.

Comments??
Kevin B, RHCE, MCP
 
as far as i am concerned, last known is when you actually shut down
correctly. so if you add something and it works fine,shut down, all related
problems will still exist. so there is another thought...aka,create a restore
point before you install!!!!!

Kevin1aB said:
Hello
The 'LKG' is a bit different that what you are thinking.
It is overwritten everytime you successfully logon.
So in your scenario, the user installed a driver or MS update,
rebooted, logged in [LKG overwritten at this point]
then went to rollback 2 days but the LKG is now the
one from the current logon. The LKG is still the current one if
you F8 and select it.
I think of restore points for snapshots and LKG is
for things like when installing new hardware and the system
blue screens on reboot.

Comments??
Kevin B, RHCE, MCP


Gautam Bhagwandas said:
Hi friends,

Just a small scenario to understand what exactly does Last Known Good
configuration do.

A user installs an application or does a driver update or a windows update.
He then does a System restore to rollback the system to the restore point
created 2 days back. Now, if he does a Last Known Configuration, will the
recently installed application be functional or will the recently installed
driver / windows update get applied again?

Thanks a lot
Gautam
Click to expand...
Click to expand...
 
It helps the system by using the registry information and drivers that
Windows saved at the last shutdown. Any changes made since the last
successful startup will be lost.

The Last Known Good Configuration startup option allows you to recover
from a problem by reversing driver and registry changes made since you
last started your system. Windows does not update Last Known Good
Configuration information in the registry until the operating system
successfully restarts in normal mode and a user logs on and is
authenticated.

regards,
ssg MS-MVP
 
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