It seems like you've already taken several steps to troubleshoot the freezing issue on your Vaio laptop. Here are some additional suggestions to try and narrow down the cause of the problem:
1. Check for Overheating: Overheating can cause performance issues and freezing. Ensure that your laptop's vents are clear of dust and debris. You can also try using a cooling pad to see if it helps with the freezing.
2. Update Drivers: Apart from the video card, make sure that all your drivers are up to date, especially the chipset drivers.
3. Check Event Viewer: Check the Windows Event Viewer for any error messages or warnings around the times when the freezing occurs. This may provide clues about what is causing the freezing.
4. Disable Hardware Acceleration: In some cases, hardware acceleration can cause playback issues. Try disabling hardware acceleration in your web browser and media players to see if it helps.
5. Test in Safe Mode: Boot your laptop into Safe Mode and see if the freezing issue persists. This can help determine if the issue is related to third-party software or drivers.
6. Monitor System Resources: Use Task Manager to monitor CPU, memory, and disk usage while playing videos. High resource usage could be causing the freezes.
7. Check for Background Processes: Make sure there are no unnecessary background processes running that could be impacting performance.
8. Uninstall BitLord 2.0: Since you suspect BitLord 2.0 might be causing the issue, try uninstalling it and see if the freezing improves.
9. Update Software: Ensure all your software is up to date, including Windows updates and any other software you frequently use.
10. Consider a System Restore: If the issue started recently, you might consider performing a system restore to a point where the freezing issue was not present.
By following these steps, you might be able to pinpoint the exact cause of the freezing issue on your Vaio laptop. Good luck, and I hope these suggestions help resolve the problem!