This problem i facing was annoying me yesterday and i am too much confused what to do.

i tried to download iToday yesterday and went outside for some work
when i came back my iphone was sleep (off the screen to black after 5 mintues) when i on my iphone and went to intaller iToday was installed but does'nt show iToday in uninstall section.. after that every app i installed crashes to springboard when they are updated or installed.. please help me what to do?