Well, that first page is the one I used (or similar) earlier. When I try to run the Virtual PC, it says "This update is not applicable to your computer." I uninstalled Virtual XP before reinstalling it. It flashed something that I think it couldn't be installed or used or something on this computer, but it shows up in Programs and Features. When I use the Vmware player, it wants an iso or an install disk; I tried using two W98 CDs I had, but it said it couldn't find the boot file. When I install just the machine, it doesn't seem I can do anything with it. And I can't find an "import" option for the Virtual XP, as you suggested.
Also, when I click one of the vmcx files (e.g., Windows XP Mode.vmcx), it says "Could not register the virtual machine," explaining, "The virtual machine could not be registered because the configuration file does not exist. You should create a new configuration file for the virtual machine."
Since I'm fairly sure I had that file working before I had to reinstall, I must have had all the parts necessary somewhere in my backups. I'm just not sure where to look. Is the problem that it's missing from the Registry? I guess I could load a backup Registry into Notepad and look for the settings I need — if I knew what they were! Or is there a data file that would have that info? As I mentioned before, with the previous reinstall onto the new drive, I copied a lot of things I don't want to do this time, so I must have copied the things that made my Virtual XP file work, I'm just not sure what parts to look for.
Do you have any idea why trying to install Virtual PC says it's incompatible with my computer, when it didn't used to be?