Windows Modules Installer service terminated Insufficient system resources 7023

Hi,

one of our Servers gets this error, every hour:

Log Name:      System
Source:        Service Control Manager
Date:          10.12.2012 09:42:59
Event ID:      7023
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      SC02.domain.local
Description:
The Windows Modules Installer service terminated with the following error: 
Insufficient system resources exist to complete the requested service.
Event Xml:<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"><System><Provider Name="Service Control Manager" Guid="{555908d1-a6d7-4695-8e1e-26931d2012f4}" EventSourceName="Service Control Manager" /><EventID Qualifiers="49152">7023</EventID><Version>0</Version><Level>2</Level><Task>0</Task><Opcode>0</Opcode><Keywords>0x8080000000000000</Keywords><TimeCreated SystemTime="2012-12-10T08:42:59.755909200Z" /><EventRecordID>86831</EventRecordID><Correlation /><Execution ProcessID="600" ThreadID="2192" /><Channel>System</Channel><Computer>SC02.domain.local</Computer><Security /></System><EventData><Data Name="param1">Windows Modules Installer</Data><Data Name="param2">%%1450</Data></EventData></Event>

I checked some Facts with this (http://technet.microsoft.com/en-us/library/cc756318(WS.10).aspx):

C:\Users\administrator>sc query TrustedInstaller
SERVICE_NAME: TrustedInstaller
        TYPE               : 10  WIN32_OWN_PROCESS
        STATE              : 1  STOPPED
        WIN32_EXIT_CODE    : 1450  (0x5aa)
        SERVICE_EXIT_CODE  : 0  (0x0)
        CHECKPOINT         : 0x0
        WAIT_HINT          : 0x0

SFC /scannow don´t run:

C:\Users\administrator>sfc /scannow
Windows Resource Protection could not start the repair service.

we don´t recieve the "Low Registry Space"!

Manal Startup of "TrustedInstaller" reports the same error:

The Windows Modules Installer service terminated with the following error: 
Insufficient system resources exist to complete the requested service.

a import of the "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TrustedInstaller" isn´t successfully:

cannot Import C:\users\administrator\vs02.reg: Not all data was successfully  written to the registry. some keys are open by the System or other processes.

A clean Reboot don´t helps.

A logon with my Domain account reports this error:

1508
Windows was unable to load the registry. This problem is often caused by insufficient memory or insufficient security rights. 
 DETAIL - Insufficient system resources exist to complete the requested service.
 for C:\Users\domainname-a\AppData\Local\Microsoft\Windows\\UsrClass.dat

and
1542
Windows cannot load classes registry file.
 DETAIL - Insufficient system resources exist to complete the requested service.

Can anyone help?

Kind regards Joerg