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Windows 7: System restore points deleted on Win 7 in dual boot with XP

26 Jun 2010   #1

Windows 7 32bit, Windows XP Pro., Ubunto.
System restore points deleted on Win 7 in dual boot with XP

Because of the differences in the system restore technologies between windows 7 and windows XP, when booting out of XP and into Win 7 Pro the Win 7 restore points will have been deleted. My scenareo is XP - original system on first physical disk (boot loaders are here) and Win 7 on third physical disk, with second physical disk just for data.
There are various tutorials about doing the registry fix in XP as in KB926185, by using the registry hack HKLM\System\MountedDevices\Offline and setting the other system DWord to 1. However, I have done this and it doesn't fix the problem, as I keep up to date images, its not mission critical but it would be great if I could finally resolve it. Has anyone else had the problem with this registry fix not working (I cannot use bitlocker because I don't have Ultimate). Mike
My System SpecsSystem Spec
26 Jun 2010   #2

Windows® 8 Pro (64-bit)

My System SpecsSystem Spec
26 Jun 2010   #3

Windows 7 32bit, Windows XP Pro., Ubunto.

Yes, as in my thread I have used this technique both manually and by downloading the reg fix and editing the drive letter and merging registry in XP. As posted it just doesnt work on my system.
My System SpecsSystem Spec

26 Jun 2010   #4
DarkStar GT

Windows Home Premium (64)

... doesn't work here either.

XP is first partition on disk, Windows 7 is the second partition
My System SpecsSystem Spec
27 Jun 2010   #5

Windows 7 32bit, Windows XP Pro., Ubunto.

It would be interesting to hear from anyone who has done this and that it has worked for them. This is an extract from Microsoft KB926185 about the workaround.

Effects of this workaround
After you restart Windows XP, you cannot access the volume that is created in Windows Vista

from Windows XP. However, you can still access the volume that is created in Windows XP from

Windows Vista. You must use Windows XP drive or an additional drive such as a USB thumb

drive for data exchange.
Limitations of this workaround
This workaround only protects the volume in Windows Vista from being accessed or changed by

Windows XP. If you have more volumes or if you want to add a volume from Windows XP to the

system restore settings in Windows Vista, the system restore (Volume-Shadow-Data) on those

volumes will be still overwritten. To avoid this problem, you must add those volumes to the

HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices\Offline subkey. If you add the Windows XP volume to

that subkey or if you delete this volume drive letter, you cannot then start Windows XP.

You can use this workaround only when the restore points for Windows XP and for Windows

Vista are mutually exclusive. The restore points are mutual exclusive when no restore points

are common across the volume in Windows XP or the volume in Windows Vista. For example,

consider the following scenario:

* The C driver is a volume in Windows XP.
* The D driver is a volume in Windows Vista.

In this scenario, the Windows Vista restore points are added on the E driver. Then, you must

change the registry entry of the E driver under the HKEY_LOCAL_MACHINE\SYSTEM

\MountedDevices\Offline" registry subkey to 1.

Also, a common volume can be used for data exchange between Windows XP and Windows Vista.

However, restore points must not be defined on this common volume.

I'm not sure what the mutually inclusive bit means, and also I can still access the other systems drives after the fix has been applied. Rather than re-installing systems totally separately and controlling via a third party boot loader and/or changing bios I would like to see where I am going wrong with this fix. Any comments from guys who have done this work around with success. M
My System SpecsSystem Spec
27 Jun 2010   #6

Windows 7 Home Premium 64-bit (6.1, Build 7601)

Here is something from the past:

Might be of use.. as of course it might not.
My System SpecsSystem Spec
27 Jun 2010   #7

Windows 7 32bit, Windows XP Pro., Ubunto.

Thanks for the comment, we had already visited that one, and the fix doesnt work on my system for some reason. Has anyone had any success with the fix? M
My System SpecsSystem Spec
26 Mar 2011   #8

Windows XP Pro 32 bit, Win 7 Home Prem 64 bit


I know that this thread has not been active in a while, but it seems like the right place to post. I applied the manual fix for KB926185 described in the tutorial provided (very well-written) under the Vista discussion. However, I found that every time I rebooted, the deleted \DosDevices\K: key kept on reappearing after each deletion even though it was listed under Offline subkey.

I have Win 7 Home Prem 64 on one hard drive and Win XP Pro 32 bit on a second hard drive. There are a number of partitions on the Win XP drive so that is why Win 7 showed up on K:

Anyway, I tried the deletion a number of times, but the K: drive would reappear and I could access the contents, it was not just showing up but appearing blank some postings to the tutorial indicated might happen.

One other bit of information is that besides the MountedDevices Key in the registry, there is also a MountedDevice1 Key. There was a reference to K: there also. I did not do anything to the subkey for K: under MountedDevice1. It had a different value there than it did under MountedDevices. Other postings to the KB926185 tutorial also mentioned MountedDevice1 but it was unclear whether something needed to be done to it or whether deleting the subkey would cause additional problems.

Finally, the only way to make the drive "go away" was to disable it through the device manager under XP.

Does anyone have an idea why the drive would keep reappearing? Thanks.
My System SpecsSystem Spec

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