Why isn't the Unity Web Player working?

I have no idea what is going on with the Unity Web Player. I have a gaming website and now none of my games work anymore! There’s always an error that says “Unity Web Player requires DX9 level graphics card. Make sure you graphics card drivers installed.” I have DX9 graphic card drivers installed on my computer, so that isn’t the problem. I tried restarting my computer, refreshing the page, and re-installing the Unity Web Player, but nothing worked. I’ve tried other games besides my own and they don’t work either. If it doesn’t say I need a new graphics card, it will say that the web player has crashed. Does anyone know what is going on?

There was a bug in Unity 4.3.0 where some old Intel DX9 GPUs (945, 3150 etc.) were deemed not supported. We have fixed this in Unity 4.3.1.

Your old Intel GFX chip is no longer supported. Sorry.

4.3 changes state anything pre-DX9 is now unsupported, however, as your 2011 DX11 3150 GMA is missing one or two GL extensions, it loses total support.

Some of this is intentional, some of it we think is a bug.

Edited (I was correct):

Extract from 4.3.1 Update Notes:

Fixes - Graphics: Fixed Intel DX9 GPUs (like Intel 945) incorrectly
being labeled as unsupported by Unity.

We need exact details on which GPUs aren’t working. Operating system version, GPU model, driver version etc.

Is my GeForce 8400 GS older than the DX9? Please tell me, because I can no longer play my favorite games.