I have Vista, WinXP Pro, Win98, Win2000 and 2 or 3 flavors of Linux on my
Vista computer.
All these OS's are on ONE partition and each OS doesn't confect with any
other OS.
I use a program called Parallels
http://www.parallels.com/en/products/workstation/. You load each Operating
system just like you would on a normal computer but Vista being my Host OS
and all the others are a Virtual Computer Systems.
If you want to game this won't work but for running "most" apps this is an
ideal way to run these OS's on a single computer without rebooting. With my
2 GB Ram I can run Vista, Win XP and Win2000 and RedHat Linux all at the
same time ( with tweaking on each VM ram usage)
They have a trial and it's worth a look to see if it suits your needs, and
no I don't work for them I just like the program as it solved my testing
issues for the software I run. Oh and the VM's run fast for almost all of
the programs I run.
c/p from website below
Harness your PC's full power and potential!
Use Windows? Like Linux? Have it all on a single PC.
Parallels Workstation is an easy-to-use, easy-on-the-pocket solution that
lets you run Windows, Linux, and more side-by-side on a single PC without
rebooting.
Truly revolutionary, Parallels Workstation empowers users of any skill
level - including computer professionals, sales executives, and home users -
to easily run multiple operating systems on a single computer. Completely
networked. Stable. Secure.
Do more with your PC!
a.. Users upgrading to Windows Vista can run legacy software not fully
compatible with the new OS in previous versions of Windows on the same PC.
b.. Computer professionals can run multiple applications, optimized for
different operating systems, all at the same time and reduce dependency on
specific hardware and OS configurations.
c.. Software engineers can test and support software, OSes, and
configurations in different use scenarios and set up a menagerie of testing
environments on their preferred platforms.
Why Parallels Workstation?
Easy to Install, Easy to Use
Fast to set up, intuitive to use, Workstation is designed from the
ground up to make virtualization easy, regardless of your skill level. It
even includes Parallels Tools, a special toolkit to help you make the most
of its advanced features and functions.
High Performance
Run your favorite software at near native speeds! Workstation is
optimized to take full advantage of hardware virtualization through support
of Intel VT and AMD's Security and Virtual Machine (AMD SVM) for secure,
high-performance virtual machines.
Flexibility
Have the broadest range of x86-based operating systems at your
fingertips, including Windows, Linux, FreeBSD, OS/2, eComStation, Solaris,
and MS-DOS.
Strong, Stable Virtual Machines
Workstation's Lightweight Hypervisor gives the virtual machine direct
access to the host computer's hardware, which lets you run Windows, Linux,
and more all at the same time in a stable, secure, high-performing
environment. The inclusion of this trusted, mature technology ensures that
virtual PCs built using Parallels Workstation are maximally stable and
efficient.
Easy on the Pocket
Get advanced features designed for every user at an unbeatable price.
Parallels Workstation gets the job done without burning a hole in your
pocket.