Hi, I currently have windows XP in my computer, I would like to know where to download Unix and how to do a dual boot with XP and unix. Thanks

Go here...

http://www.unix.org/

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Unix?
Unix like OS or Linux and freebsd?
If you want linux, installing it after winxp is very easy. The only problem is that you need clean space on your Hdd or a disponible partition to install linux. It will install with ext2 file system and need its own partition to be installed.
Where to download: You can search for names like Fedora Core 3, Mandrake Linux or Red Hat and you will find links to these unix like OSs for download.
If you like, you can use Linux without installation, just to try and see how it works. Search for knopix linux distribution.
Almost all linux came in CDs (iso images) that you can download from the distributor websites, but these are very big files. May be better to order a CD!
If you do not have such clean space or partition, you can use Partition Magic to remodel your previous partitions and open the required space. I recomend to back-up your data first, due to the risk of data loss whem resizing partitions. See the partition magic or similar software documentation for more info. I recommend to you to free at least 5Gb to a linux installation and to have some space in FAT32 for full access and full sharing of files between the two OSs, since support to Ext2 on Windows is very limited and buggy as soon as access to NTFS under linux (this one is better, but you will use it as read only access).
If I understood what you´re looking for, this will help. But if you plan to have the old Unix, I really don´t know where you will find it, and can´t figure why someone may want it today. Well, you can have your own motivation... ;)

All of us have too much to learn, but with some luck we can even help someone.

Loosely, the order of things will be as follows:

-Install Windows XP Professional and give it 2.0 GB of space out of the 4 GB available.
-Install Red Hat Linux 7.3 into the other 2 GB.

Simple, eh?

Installing Windows XP Professional

To dual boot, you can install Windows XP exactly as you normally would, while making sure to leave room for the Linux partition.

Installing Red Hat Linux 7.3

Once Windows XP is installed, you can install Red Hat Linux 7.3 by inserting CD One of three and letting it boot. Then, just follow the instructions on the screen. When it's time to partition the disk, I chose the default option to Remove All Linux Partitions On This System since I had no Linux partitions

Then http://uk.builder.com/programming/unix/0,39026612,20265546,00.htm

After you've installed these os's it's convinient to use third party software to choose which one os do you want to boot. There is only one software for it or may be two, but Acronis OS Selector is better cause it has easy-to-use tool to manage booting of multiple operating systems on a single PC and protect your computer from boot viruses.

More about it http://www.acronis.com/homecomputing/products/osselector/

I simply use GRUB that came with my Fedora Core 3 and it can read the NTFS partition... Because of this, it can be installed without the limitations of LILO. No more set-up or anything extra to do with this configuration. Install winXp normally and after this, install Linux Fedora Core 3 normally. The result is a dual boot machine, without more setup issues...
I admit, otherwise that I don´t know if it is as secure as the [10^6]gamer method, and if with this option you can have easier recovery methods in case you need to reinstall windows in the future...

A stupid question:
UNIX isn´t only a standard? There were any time in the past a real UNIX O.S. distributed by anyone, or ever were Unix like OSs? The older I know is Solaris.