Restore Computer

Few days ago, math teacher from school brought me an old Acer because his computer need restore. (The computer has so many virus)
I found that the virus made the windows crash so seriously after I checked up.

Acer Aspire M3300 (Rate seems good)

Some details about computer

I plug my monitor and some stuff to the computer

Inside

Choose USB - Compact to boot
And I put Windows 7 Ultimate into the USB

Installing

Done !

Finally I just install drivers and some common software.
I return the computer back after all. ( And the teacher looks happy)