No problem if you wanna install windows only, doesn't void the warrenty too. Its just a freaking waste of money if you want to do so. Why get a mac if you wanna use windows, the only valuable aspect of a Mac is its operating system.

However, there might be a few problems such as if there is a problem with your Windows, service center's might be reluctant to help you as it is not in their expertise or from plain dislike of windows.

Don't worry about switching to a Mac platform. Its basically made to be easy to use for the average non-tech savvy person. It just takes some getting used to as the typical stuff of using a computer are still the same, just interface differences.