Press Caps Lock on your keyboard. (CS3 toggles precise cursors with Caps Lock).
If you absolutely need the specific interface or features of Photoshop CS3 and cannot upgrade to a modern version, consider purchasing a used legitimate license (though Adobe no longer supports activation for CS3, making even legitimate copies difficult to run on modern systems). Otherwise, embrace the many excellent, legal alternatives available today and keep your computer—and your conscience—clean.
Files hosted on personal Google Drives are often bundled with spyware, ransomware, or trojans.
If you need free or low-cost image editing software, numerous legitimate alternatives exist that are safe, regularly updated, and often as powerful as older versions of Photoshop.