Tablet PC Input Service defaults to Manual at restart

I just recently upgraded to windows 7 Pro from Vista Business and now on every restart my tablet pen stops working. On investigation I found that the Tablet PC Input Service defaults to manual on every restart. I have tried changing it to Automatic but on the next restart it again defaults back to manual. This causes a lot of problem as the inking is disabled and I cannot use the tablet functionality unless I turn the service ON.

Can someone please advise me how to make sure that he service stays ON permanently.

Thanks & Regards

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