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No, vitamin C does not help prevent colds. A meta-analysis[1] of 10,708 participants in various studies showed that the risk ratio of contracting a cold while on vitamin C prophylaxis was 0.97 for the general populace.
The vitamin C dosage was 500 mg once a week (equivalent to about 70 mg daily) before colds, but 1,500 mg the first day of a cold followed by 1,000 mg on the second and third days. No reduction in the incidence of colds was observed, but those taking vitamin C averaged less time at home (1.62 vs. 1.12 days indoors).