Need some help using BootCamp on MacBook Pro 2011

As you are using OS X Mountain Lion and looking at the MacBook Pro you are using, you can install a 64-bit Windows 7 or 8 version, but you can't use Windows XP or Windows Vista. If you haven't got Windows yet, buy Windows 7 on a DVD in Amazon or eBay, or Windows 8 from the Microsoft Store or Amazon (make sure that you buy it on a DVD).

What you have downloaded to your USB drive are the Boot Camp drivers. Those drivers are for all the hardware of your Mac, because Windows doesn't detect everything, so you need those drivers to run Windows properly and get the maximum performance of the MacBook Pro. You have to install them just after installing Windows.

If you need help installing Windows with Boot Camp, see > http://manuals.info.apple.com/en_US/boot_camp_install-setup_10.8.pdf

Use a crack with Windows 7 on your Mac and you may break the whole boot sequence of both Windows and OS X. It's so dangerous to do that on a Mac, apart from the fact that it's illegal and that they may include viruses. You can only use an original, full Windows 7 or 8 version with a Mac

Windows 7 has dropped its price a lot because of the Windows 8 release. For example, this is the price of Windows 7 Home Premium on Amazon > http://www.amazon.com/Microsoft-Windows-7-Home-Premium/dp/B002DHGMK0 Unfortunately, Windows 7 isn't available as a download anymore, but it was before the Windows 8 release.

Windows 8 is available as a download and on a DVD. As a download, you can get it from the Microsoft Store > http://www.microsoftstore.com. However, only the upgrade version is available as a download, so you have to get the full Windows 8 version ("System Builder") on a DVD in Amazon or eBay. Its price is similar to the Windows 7 price

If you don't want to learn a new graphic interface, Windows 7. If you want the most recent Windows version and you don't mind a new graphic interface, Windows 8