@Dilrod: I am currently having the exact same issue. Where did you go to uninstall it? Did you lose progress in the game?

Boil some water and hold the controller over the boiling water and let the steam do the work for you. I've done this and it works great!

MEAN STREAK - Y&T

GOD OF THUNDER - KISS

MEAN STREETS - VAN HALEN

My feeling is that the demo shouldn't crash on the title screen when the ethernet cable is plugged in, thereby forcing you to unplug the cable, then load the demo, then sign in again.

Other than that, the demo is GREAT!