testBuzzer error

As a newbie to arduino ,I follow the AssemblingInstructions and when I compile the tesBuzzer.ino , I got this:

Error reading file (D:\Program Files (x86)\Arduino\hardware\arduino\avr\boards.txt:0): Invalid line format, should be 'key=value'

为开发板 Arduino Pro or Pro Mini 编译时出错。

there is no "key" sentence in the old boards.txt.

and when I connected the usb line to FDTI, I got this:

为开发板 Arduino Pro or Pro Mini 编译时出错。

找到无效库在 C:\Users\28195\Documents\Arduino\libraries\i2cdevlib-master: no headers files (.h) found in C:\Users\28195\Documents\Arduino\libraries\i2cdevlib-master

Is there any path need to be set?