MS ForeFront TMG 2010 DHCP problem

There is a Windows Server 2008 R2 machine in our office which is configured as DHCP server with Microsoft ForeFront TMG 2010 installed. The system was running all good for the last 3 years. But last week it showed a fatal error (no error code), so we had to restart it. After that, ForeFront TMG services aren't auto starting although it's set to Automatic. We had to manually start 4 out of 5 services to properly run the DHCP server. The system was restarted several times before the problem appeared, but it never gave any troubles. How to solve this problem to start those 4 services automatically even when they are set to Automatic?
 
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