Would you mind checking Vista's VirtualStore to see if there are VV4-related files in there? The VirtualStore is a hidden folder, so you will need to change the folder view options to allow you to see VirtualStore. To do that:

1. Open Control Panel
2. Type "folder options" in the search field in the upper right of the window
3. Click on the Folder Options icon
4. Click the View tab
5. Click the radio button next to "Show hidden files and folders"
6. Click Apply

Now that you have the ability to view hidden files and folders, you can look at what's in VirtualStore. To see that folder, do the following:

1. Click Start
2. Click Computer
3. Open Users
4. Open the folder for your user name
5. Open AppData
6. Open Local
7. Open VirtualStore

If you see any files in VirtualStore that are VV4-related images, you can safely delete those and see if that corrects the issue you're having.