service cannot be started because it is disabled or because it has no enabled devices associated with it

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C#3.0

C#

I am writing the following code to get windows updates installed. But I am getting error "The service cannot be started, either. (Exception from HRESULT: 0x80070422)" in GetTotalHistoryCount(). this code worked well in windows 7 but now gving this error in xp

this is my code

var updateSession = new UpdateSession();
var updateSearcher = updateSession.CreateUpdateSearcher();
var count = updateSearcher.GetTotalHistoryCount();
var history = updateSearcher.QueryHistory(0, count);
for (int i = 0; i < count; ++i)
    ls.Add(history[i].Title);

thanks
swati