Jan 26 (Reuters) - The S&P 500 hit a record high at the open on Tuesday, helped by positive earnings updates from a slew of companies including General Electric and Johnson & Johnson, while the Federal Reserve kicked off its two-day policy meeting. The Dow Jones Industrial Average rose 8.5 points, or 0.03%, at the open to 30968.55. The S&P 500 rose 7.6 points, or 0.20%, at the open to 3862.96, while the Nasdaq Composite rose 45.7 points, or 0.34%, to 13681.717 at the opening bell. (Reporting by Devik Jain in Bengaluru; Editing by Shounak Dasgupta)