How can I install Arduino MEGA 2560 in Windows 7 ?

Hi everybody

I bought an Arduino MEGA 2560 and I can't install that in Windows 7 (32bit)

My arduino board picture :

http://s9.picofile.com/file/8324785676/mega1.jpg

IDE tools menu and Configures :

http://s8.picofile.com/file/8326938192/toolsmenu.jpg

The device manager and USB port situation :

http://s8.picofile.com/file/8326937892/dvcmanage.jpg

After upload source error message :

http://s8.picofile.com/file/8326937984/error.jpg

And I tried to install USB drive with Update Driver in path " F:\Programs\Arduino\drivers " but windows could not install the drive and did not find any driver in this path ...

I am really confused ,,,,

Thanks

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