Want to test drive Windows Vista and Office 2007 on your Windows XP? That to without installing any software and disturbing your existing PC installation? Yes you can do that.
Microsoft published a free VHD containing Windows Vista and Office 2007 which allows users to experience how they simplify day to day activities.
You can download this free VHD from Microsoft Download Center and run it on your Windows XP system by using your Virtual PC Software - no need to install or uninstall any software, just mount the downloaded VHD using Virtual PC software and use it; so this is a hassle free test drive which will not alter any of your system settings.
This free VHD contains 30 day trail version of Windows Vista Enterprise Edition and evaluation copy Office 2007 Professional which includes Publisher, Excel, Outlook, Power Point, Access and Word.
Here is the link of Microsoft Download Center which hosted this free VHD. Approximate size of this download is 2 GB and requires 10 GB of free disk space on you PC for smooth running.