Extra steps are required to give Prism authorization to upload to Google Drive and/or YouTube when running on Windows XP or Windows Vista:

1. Click Authorize... in the Authorization dialog.
2. In the web page that opens, sign in to your Google account, if required.
3. Confirm that you authorize Prism to access the requested features.
4. Copy the Authorization Code provided by Google and paste it in the Authorization confirm dialog in Prism.
5. Click Ready to confirm that authorization is complete.