Old Computer Help

Alright so I have this old laptop that I want to use to play League of Legends. The specs are:

Intel T2300 @1.66 GHz

1 GB Ram

Nvidia GeForce Go 7400

Windows 7 Professional 64-Bit

So I've installed the game though when I try to play, the screen flickers and the game freezes. Any ideas as to why this happens?

Thanks!