If you've never installed an OS before, it's remarkably easy. If you have, I'd still suggest reading through this guide to make sure you've got it all down. Installing Windows on a custom machine can ...

Formatting a hard drive along with the install of a new OS is the best option. The vast majority of operating system installations provide a "format" option as part of the installation process.

Apple has released OS X Lion as a download from the Mac App Store only; however, you can use the download to create a separate OS installation disc or drive partition to use for troubleshooting ...