You may receive error message
0xC004D302 when windows activation problem, invalid product key
..., this page contains some useful information to repair your
computer error code 0xC004D302, if you fixed this error
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On already activated KMS
Host a Windows Activation window comes up with the error, an
error has occurred:
Description: The Security processor reported that the trusted
data store was rearmed."
- Changes in the default
permissions of the "C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys"
Corruption in the Licensing Files
- If you have run the slmgr.vbs
/rearm command and try to run any other activation command(/dlv
or /dli for example) prior to rebooting you will experience this
error. You must reboot after using the slmgr.vbs /rearm command
prior to attempting activation.
How to repair?
resolve this issue, if you continue to encounter this error after
restarting the computer, proceed with the following:
- Option 1:
1. Launch a cmd window with administrative privs (i.e. using run
2. In this cmd window, run the following command:
3. Collect output of this command
Review the output. These ACLS (pasted below for reference) of
this folder on the machine are wrong!
The actual ACLs (you can try this on any Vista machine) should
This explains the activation failure. Now we need to find out
the culprit changing ACLs on this folder.
Vista activation (SLSvc.exe) uses MSDN documented Win32 CAPI
(Cryptography API) to perform some cryptographic operations.
SLSvc.exe runs as network-service and CAPI calls by SLSvc.exe
fail if the ACLs on this folder change from the default values.
If the ACLs on this folder change, then the same CAPI call from
any application (not running as local-system or administrator)
will fail. The current ACLs on this machine only provide
read-access to non-admins (including NetworkService account) and
therefore CAPI calls from SLSvc are failing.
The easiest way to restore the right ACL would be to use
cacls.exe to set it.
The command for that would be:
Although it may appear so at first glance, this problem isn't
limited to a specific hardware platform. This is because these
older systems do not contain the ACPI_SLIC licensing table in
the BIOS. The newer machines that have this table must go
through the cryptographic checks (and thus they use the
MachineKeys folder when doing so). Most OEMs started
incorporating the ACPI_SLIC table in mid to late 2006.
ACL changes are not logged in event viewer. If there's not a
suspect already, the customer can audit object access after
changing the MachineKeys folder to reflect the correct
permissions to see what changes these permissions. (Check the
More Information Section for steps to enable Auditing on
- Option 2:
1. Launch a command prompt window with administrative privs
(i.e. using run as administrator).
2. Now Run the following command at the command prompt, (one
after the other)
slmgr -upk //(uninstalls
slmgr -rilc //(reinstalls licence files)
slmgr -ipk <put the apropriate KMS Host Key>
slmgr -ato //(activates the machine)
This will now activate the KMS host and is ready to activate the
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That is we find the informations to
fix 0xC004D302 error in windows 7,
hope our page is helpful to you, if
you still need more guide detail, please contact the
microsoft support for further help.
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