You can try finding Vov Sticky Notes application on Windows system tray (probably bottom-right corner of desktop).
Click the system tray icon and lost stickers should be visible now.
If you deleted your stickers unintentionally, you can try finding them using "Notes Manager".
Starting from Vov Sticky Notes v7.0, your data is stored in file system:
Before Vov Sticky Notes 7.0, your data is stored in registry:
Using the Registry Editor incorrectly can cause serious problems which may cause loss of data, and may require you to reinstall Windows. Use the Registry Editor at your own risk!