Loading World of Warcraft and its extension packs on Win 7 system.

how are you to load the WOW gaming program on to a system with Win 7? i have been at it for 8 hours now. if i use my 9 discs this is the error i receive during the 2nd disc load using Burning Crusade.
The file "Files\unconditional\user\Data\enUS\Interface\Cinematics\WOW_Intro_BC_1024.avi" in archive "C:\Users\Jeffrey\Desktop\WoW Installer\Installer Tome 2.mpq" could not be opened, because an error 104 occurred. If this problem persists, please contact Blizzard Technical Support. (MPQFile::OpenFromArchive)

if i download it off the WOW website like every WOW tech support person has told me too and other players i receive this error message.

World of Warcraft Installer
Failed to create files for World of Warcraft Installer.
Please close all applications and try again.

Where is the proper file folder AKA area on the Win 7 operating system to load this game so i may play it on my new Dell laptop?

thank you for your help and time.

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