How to install Windows OS on Pre-installed Mac OS?

[coolestjar]

I have been using Mac OS for quite longer time on my Pc and recently I feel there are many programs which are supported by windows and their functions are much in spite of Mac supported programs, so I want to get first addicted how to use windows, then I will remove Mac OS, is there anyway to install windows OS on my Mac supported PC?

[Sbrideau]

Is your computer a Mac?

If yes, you can use the program called BootCamp to have both Windows and Mac OS on your computer. I don't know much about macs either, so you should wait for someone else to confirm, but I know if you have an older mac, you can't have Windows on them because of the processor.

[winfor666]

I use Windows and Mac OS, have done so for more than 15 years. Windows XP SP2 or later, including Vista, can be installed on an Intel Mac (builds after April 2006) using Boot Camp Assistant, and can be installed on most late model PowerPC Macs (G3 or G4 processor is an example) using "Q-kju" (http://www.kju-app.org/). Mac OS can be installed on some PC systems, depending on chipset, BIOS type, etc., but it isn't straightforward, so search for "x86 mac" and "uneasy silence". I won't get into the "Mac OS on a PC" question. I'll assume you have an Intel Mac running OS 10.5 or later ("Leopard"). [Technically, you can install Windows on an Intel Mac running Mac OS 10.4.8 or later, but Boot Camp Assistant only comes with and only runs in Leopard, so you would need an older version of Boot Camp beta (http://www.soft32.com/download_200398.html) and drivers for Windows -- good luck finding them.] You need enough free space on the target hard drive for the Windows install plus some extra for program installs and such. Call it 10GB for XP, 20GB for Vista, your mileage will vary. Open Boot Camp Assistant and follow the Help guide to create a Windows partition (It will take on the name "Windows"-- Macs don't use drive letters, just volume labels). You don't have to deal with "logical-primary-active -boot.ini-NTLDR-hal.dll" or any of the other slips and trips that a PC tosses at you. Macs don't care about that. Make it FAT32 file system for XP if you want to see it while booted to the Mac system. Otherwise, make it NTFS so you can use large video files, bearing in mind that you will need a third-party solution for seeing one file system while booted to the other. This is done in the normal GUI with simple slider for resizing, no "DOS-y" stuff. The slider can only create the partition using available space, so in theory no data is deleted. Leave some additional space on the original MAC partition for updates and such. We never have enough space, eh? Now is the time to get it right. If you find after formatting for Windows that you need more space for updates, you have to erase the entire hard drive and start over.

When you're done with BootCamp Assistant, put in the Windows install disc, open System Preferences > Startup Disk. Select the Windows install disc, restart, install Windows. After that, you may already know that you can change the startup disk choice on any post-2000 Mac by holding the "opt" key at startup. Now the Startup Manager screen will show the Windows partition as a choice. After you boot to Windows, put the Leopard install DVD in to install drivers. It has an auto-load feature for this.