Please try the hotfixs in the following articles for troubleshooting.
The Single Instance Storage Groveler service stops unexpectedly during startup on a Windows Server 2003-based computer http://support.microsoft.com/kb/939383
The Single Instance Storage Groveler service stops when the "Enable SIS on this Volume" check box is selected in Windows Storage Server 2003 R2 or in Windows Unified Data Storage Server 2003 http://support.microsoft.com/kb/932198
You may also try the workaround if the hotfix cannot work on your system.
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