Picasa Database

Picasa stores its database in C:\Users\\AppData\Local\Google
The database is in the Picasa2 and Picasa2Albums folders. To restore the database on a fresh install of Picasa, just copy the database over and replace the empty one.

It was useful that Windows 8 kept the previous Windows files in a Windows.old folder as I had forgotten to backup the Picasa database separately. That has since been rectified by adding a new operation to SyncToy.

Could not open VirtualBox hard disk

After a fresh install of Windows, I had to reinstall VirtualBox. Starting the virtual machine for the first time after that resulted in an error of not being able to find the hard drive.

This forum thread on the VirtualBox forums explains how to fix it.

The solution involves editing the .vbox file with a text editor and removing the <AttachedDevice> section.