I downloaded some free apps from the app store (ScoreMobile, last.fm, Shazam, and Shakespeare), but when I try and run them, the screen goes black for a second and then it takes me back to the main menu. I had no problems getting them to work before though. I also tried updating my iPhone through iTunes but to no avail.

Anyone have the same problem, or can help?

Check this out: All the appstore apps are crashing instantly