Using Windows 7 on the MacBook Pro
Once you have installed Windows 7 on your MacBook Pro you will be able to run Windows programs. However, running Windows 7 on a MacBook Pro isn't perfect - there are some issues you should be aware of.
You will likely need to purchase a portable mouse if you have any intention of using Windows with your MacBook Pro frequently. The touchpad works with Windows 7, but it doesn't work very smoothly. Scrolling is not as smooth as it is in OS X, and the two-finger right-click motion used in OS X, although functional in Windows, often doesn't register correctly. These can be frustrating issues if you want to get anything done in Windows 7 besides the most basic tasks.
Driver issues can also raise their ugly head, although they're not as common as you might think. On my 13 inch model I've found that the biggest issue is the MacBook Pro 13's unique Nvidia 320M graphics solution. This is not something found on any Windows PC, and games often complain about it. Games still work, but they sometimes have small glitches or problems. For example, my MacBook Pro 13 will only run Starcraft 2 in a window when I play the game with Windows 7.
Finally, you can expect decreased battery life when using Window 7. Mac OS X is a carefully tuned operating system that is built to maximize the battery life of the MacBook Pro hardware Apple uses. Windows 7 is not optimized in this way for these systems, so it can't achieve the same battery life. You can still expect about 4 to 5 hours of light usage, however.