Wall St. falls as banks offset housing hope
* The Dow marked its worst close since the November 20 bear market closing low, and the S&P registered its worst weekly performance since late November.
* For the week, the Dow dropped 5.2 percent and the S&P 500 fell 4.8 percent, while the Nasdaq slipped 3.6 percent.
* The Dow Jones industrial average shed 82.35 points, or 1.04 percent, at 7,850.41. The Standard & Poor's 500 Index lost 8.36 points, or 1.00 percent, at 826.83. The Nasdaq Composite Index fell 7.35 points, or 0.48 percent, at 1,534.36.
(Reporting by Deepa Seetharaman; Editing by Leslie Adler)