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An Installment Note is a contract - and all obligations are generally enforceable unless there is any contradiction with the law.
That would be a generic answer.
If you want to address any specific clause of your Installment Note - please provide additional information and ask for clarification.
If you are looking for your previous question - it may be find here - http://law.justanswer.com/questions/151jk-valid-promissary-note-based
Please let me know if any clarification needed.