Forget the Sony support site (it’s dead anyway). Here is the manual override method that works 90% of the time.
Step 1: Remove the device Go to Bluetooth & devices > Devices. If the VGP-BMS33 is listed, remove it.
Step 2: Force pairing mode (The secret sauce) Do not just turn the mouse on. Turn the switch on the bottom to ON, then hold down the Connect button (the tiny recessed button next the laser) for a full 10 seconds until the LED flashes rapidly red and green. Sony Vaio Bluetooth Laser Mouse Vgp-bms33 Driver
Step 3: Add via "Everything else" In Windows Settings:
Step 4: The Registry Tweak (For advanced users) If the cursor moves erratically or scroll doesn't work, Windows is using the wrong HID driver. Forget the Sony support site (it’s dead anyway)
If you find an extracted driver folder, look for these files:
Warning: Avoid "driver updater" software that claims to auto-install this driver. They are often adware or malware. The VGP-BMS33 driver is not part of any modern driver database. Step 4: The Registry Tweak (For advanced users)
Ironically, this mouse works perfectly out of the box on Ubuntu, Fedora, and even ChromeOS. The Linux kernel’s Bluetooth stack recognizes the legacy Sony VID/PID without complaint. If you dual-boot, use the mouse there.