Question: when was windows 7 service pack 1 released
[{'answer': 'February 22 , 2011', 'provenance': [{'wikipedia_id': '326123', 'title': 'Windows 7', 'start_paragraph_id': 46, 'start_character': 150, 'end_paragraph_id': 46, 'end_character': 168, 'bleu_score': 1.0, 'section': 'Section::::Updates.:Service Pack 1.\n'}]}, {'provenance': [{'wikipedia_id': '326123', 'title': 'Windows 7', 'start_paragraph_id': 46, 'start_character': 0, 'end_paragraph_id': 46, 'end_character': 436, 'bleu_score': 0.97451705556073, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9491976007634958044}, 'section': 'Section::::Updates.:Service Pack 1.\n'}]}]