Well i've been looking for some unix systems to download but with all the technical stuff they talk about on the sites i think that it would be betterif i just bought oneat a store so it comeswith directions and stuff, but is there any unix system that will coincidentally run with MS-dos mode? and if so would i be able to by that at any normal electronics store like circuit city?. In some o the web stes i went to it says stuff about having to reformat the system and this stuff is just a little complicated so if anyone can help it woul b appreciated.

You may try cygwin. Its a MS based Unix.
Here is the link http://www.cygwin.com/

A small cut out from the page:

Cygwin is a UNIX environment, developed by Red Hat, for Windows. It consists of two parts:
A DLL (cygwin1.dll) which acts as a UNIX emulation layer providing substantial UNIX API functionality.
A collection of tools, ported from UNIX, which provide UNIX/Linux look and feel.
The Cygwin DLL works with all non-beta, ix86 versions of Windows since Windows 95, with the exception of Windows CE.