Hi Jaxx.F
It would seem that although you have created the recovery media the trigger for reminding you is still there.
Have a look in both msconfig (Startup tab) and Task Scheduler for anything that could launch the reminder. You may find there is an executable called VaioReminder.exe located in Programme Files > Sony > Vaio Reminder (models probably vary).
Unfortunately the only way of checking that the disks work correctly is to use them to restore to factory settings.
Rich