But then a couple of years ago things started to fall apart. I was still using a DOS based address list, and one day it became inoperable. Then a year ago all of the icons on my Windows XP virtual computer screen went similarly inoperable, only making a clanging sound when I clicked on the icon. Given that the Windows XP virtual mode itself wasn't widely well known, attempts to look for a fix were fruitless. But my XP mode start menu was still operating, so running programs off of that was a satisfactory workaround.
But then the other shoe dropped the other day, when I tried running the Windows XP virtual computer, and while it launched, everything was dead as a doornail. I decided to take one last search on the internet, and found a discussion which seemed to say that a single file deletion could get Windows XP up and running again. Breathlessly I looked for the file as directed and found it and deleted it. Then running the Windows XP virtual machine, while having to clear a dialog box which indicated not everything was perfect, it ran beautifully--my Key Mailer DOS program was running again as was my Microsoft Access. So if it happens again, here is the magic file: Windows XP Mode.vsv in the folder C:\users\