Miscellenous software reccomendation?

My laptop recently got a virus on it from windows and there was no way of fixing it so i had to wipe the computer clean. The people at the computer place backed up all my stuff. SO i have my computer now and i havee all my documents and pictures. I dont have all my programs that i had, like itunes. So my itunes got wiped and i need to know did i lose all my music that i had on it. In the backup folder there is a sub folder for itunes but since it is not on my computer i cant access it. If i download it will all my music be there Please can some one help answer my question !  unlock iphone 3g