There is an interesting release from Microsoft to permit Windows 7+ users to run older apps under Windows XP.
At first looks like a compatibility layer, but inside the download file comes a nice VHD file already packed with Windows XP ready to be used.
The download link is here: https://www.microsof...ls.aspx?id=8002
After getting the executable, use 7zip to extract the contents. I've used the command line so it can auto-detect the compression formats. Then look inside at the file /sources/xpm and extract that one too, its where the VHD file is found. Then you see the 1.1 Gb file decompressed that you just need to add an extension .VHD to use from VirtualBox.
The full set of instructions with screenshots can be found here: http://www.makeuseof...m-microsoft-si/