That just closing roblox like pressing the X button. It will not fix corrupted/broken Robloxapp.exe... If it is broken tip: Make a new user account (As in windows on your pc), then install roblox problem fixed. Problems with graphics w/ laggy after update, update your drivers/install them if you haven't from here: http://www.roblox.com/drivers/Default.aspx. Graphics too old problem; Your graphics card is too old so therefore you have to upgrade your graphics which means buying a new graphics card or a new pc! ~TheITH3n