Johhni
I was afraid that would be the case since Statemgr is listed in the protected file listing used by SFP (System File Protect). There is couple of ways around this problem if you are will to try them one at a time. We will first go with the suggested method by Microsoft.
Click here for link
Listed below are the files to my knowledge that are associated with system restore and listed in the file
Filelist.xml
<REC>%WinSys%\restore\Disablesr.exe</REC>
<REC>%WinSys%\restore\EnableSR.exe</REC>
<REC>%WinSys%\restore\filelist.xml</REC>
<REC>%winsys%\restore\rstrlfn.exe</REC>
<REC>%WinSys%\restore\rstrui.exe</REC>
<REC>%WinSys%\restore\SRFrame.mmf</REC>
<REC>%WinSys%\restore\StateMgr.exe</REC>
<REC>%winsys%\restore\StMgr.exe</REC>
<REC>%WinSys%\restore\vxdbuild.exe</REC>
The second method requires moving the above listing from Protected section of the Filelist to the unprotected section so the extraction can proceed.
This process is rather tricky since it involves using DOS to edit.
Here is an Article that gives you an overview of PCHeath, File protection, and System restore.
If you wish to view your machines listing do a search on
FILELIST.XML once found open it with notepad.
As you will see there is two major sections, one protected, one not protected.
Take care
Dave