I dont know if I just didn't see it but I can't find answer for my question - if I could use both os x lion and windows on my macbook pro while using bootcamp. I want to use windows only for playing games and lion for every other stuff. Also how much would it cost to install windows 7?
You can use Boot Camp to run BOTH OS X and Windows, but they can not be run at the same time. The cost of Windows 7 can be found by searching the web. Generally > $100. But that will be the only cost, as boot camp is a free utility that ONLY requires the windows disk.