Getting & installing the right bootcamp... (osX/windows7)

Hello everyone,

I install windows seven on a second partition, and now I'm trying to install the drivers (for the sound etc...), so by using bootcamp. But the 'Bootcamp assistant' can't download it to my USB saying "Not available on the software serv." (translated from french...).

I download the BootCamp5.1.5621, uncompressed it, copy it to USB, and I went to the Windows partition to install it and here :

- in BootCamp5.1.5621>Bootcamp, the 'setup.exe' is not compatible with my computer

- int BootCamp5.1.5621>Bootcamp>Drivers>Apple, the Bootcamp.msi can't be install because have found some errors...

I don't know what I can do... any idea ?

Thanks !

PS: I have a macbook pro (model mid-2010) running os x 10.9.2