When I launch ComputerManagement and click the DiskManagement Tree item, I get

"An internal error has occurred. Please restart the disk management snap-in"

So I Run MMC, follow the instructions to add the DM snap-in, but:

1) On exiting MMC, with or without a save of the consol, and re-launching CM, same error
2) Even before exiting MMC, clicking on the newly created snap-in also causes the same error

... I have tried many permutations on this theme

Then I try the MS instruction in case of problems "use multiple adds", and then remove first instance
--> same result, "An internal ... please restart etc".

I would be grateful for any advice on how I can get the Disk Management snap-in to work again, and could this be something to do with a registry error?

"When I launch ComputerManagement and click the DiskManagement Tree item, I get

"An internal error has occurred. Please restart the disk management snap-in"

So I Run MMC, follow the instructions to add the DM snap-in, but:

1) On exiting MMC, with or without a save of the consol, and re-launching CM, same error
2) Even before exiting MMC, clicking on the newly created snap-in also causes the same error

... I have tried many permutations on this theme

Then I try the MS instruction in case of problems "use multiple adds", and then remove first instance
--> same result, "An internal ... please restart etc".

I would be grateful for any advice on how I can get the Disk Management snap-in to work again, and could this be something to do with a registry error?"

Try to run it BY ITSELF first...

Start Button-> Run Command -> diskmgmt.msc



* If it will not run BY ITSELF, you have a larger problem than MMC.exe not being able to leverage it...

EDIT PART -> I have seen Microsoft Management Console have problems when the TMP & TEMP environment variables are set wrong... e.g.- to a disk that does not exist or has insufficient space! You can check your TEMP & TMP variables & system-wide environment strings via the Control Panel, System Icon, Advanced Tab, Environment button... be sure it is set to a disk & folder that exists & has enough freespace on it!

APK

P.S.=> You're STILL running it via MMC.exe (Microsoft Management Console) but, this time, it's ALL by itself... running by all .msc files being associated with MMC.exe... apk

Thanks for that, but no joy

1) Start Button-> Run Command -> diskmgmt.msc results with a quasi blank consol (eg. get main window, but now child windows and no functionality) and the same "snap-in" error message

2) Temp/Tmp are ok, they are on the C:\WinNT\Temp etc as they should be with "%SystemRoot%\TEMP" as the actual values, and plenty of free space.

??? what to do, have done boolean search on MS and web for this problem but no luck yet