Putting a password on your bios will prevent anyone but the user from running the computer let alone installing another operating system. Can't think of any other way to prevent operating systems from being installed/used. Encrytped hard drives can be formatted. Password protected bootloaders don't prevent other systems from being installed.
a hackintosh is just a normal pc set up to run mac, most pc's run linux fine.
All pcs can run Linux. Specifically, you can download and run Ubuntu, which is Linux based. Any PC can run Ubuntu and/or dual-boot Windows and Ubuntu.
Yes, a small business can be run using Linux. Two popular operating systems are Ubuntu or Linux Mint.
you don't unless you install Linux on it and install wine from Linux and only some games can play in Linux so stick to playing PC games on the PC
No, World of Warcraft is only for the PC and MAC. It can also run on the Linux type of operating systems using W.I.N.E. or another Windows simulator, although Linux is not supported officially and there is no Linux WoW Client.
Generally yes. Most Linux versions will work on a standard home PC, and many will work on one too old and slow to run Windows.
Currently, yes, it is just for Windows based PC's. However, you might be able to get it to run on Linux and/or MAC with a windows emulation software, although, that is not officially supported.
You can, absolutely. Linux's bootloader is, in fact, designed for multi-boot.
One cannot be considered "better" than the other, because they aren't directly comparable. Linux is an operating system kernel. A "PC" is a hardware platform. Linux can run on PCs, as well as other types of computers.
Yes, you can run Microsoft products under Linux. Any PC compatible program can be run using Wine.
A PC is a Personal Computer, doesn't matter what the operating system is necessarily. Could be Linux, Windows, etc. The only distinguishing factor is the Mac.
No, World of Warcraft is only available for PC and MAC computers. However with a little tweaking you can get it to run on Linux computers with a windows emulator.