Tail winds from Thursday's rally and some after hours earnings could help stocks Friday.

But ahead of the opening bell, there are some key events that could affect trading. Microsoftreports its earnings and Fed Chairman Ben Bernanke speaks at the Boston Fed's annual conference. Bernanke starts speaking on financial regulation and supervision at 8:30 a.m. and takes questions after his speech. Existing home sales for September, released at 10 a.m., will also be important.