Alright everybody.. Same situation for me. Two HD 4850's in crossfire mode.. I updated some drivers and started to get the BSOD with the atikmdag.sys error. I actually came up with a fix for this 4 hours later that doesn't require you to reformat your computer. In my case, here is exactly what I did:

Hello AMD team. I was install windows 10 and i tryed hd4850 driver but not install. Future hd 4850 driver for Windows 10? Install AMD ATI Radeon HD 4850 driver for Windows 10 x64, or download DriverPack Solution software for automatic driver installation and update.

Download the latest drivers for your ATI Radeon HD 4850 to keep your Computer up-to-date. Download AMD ATI Radeon HD 4850 video card drivers or install DriverPack Solution software for driver update. Download ATI Radeon HD 4850 Graphics Drivers for Windows 7, 8.1, 10, Just update ATI Radeon HD 4850 Graphics drivers for your device now! Download latest graphics drivers for AMD/ATI Radeon HD 4850 and Microsoft Windows 7 32bit. The AMD Driver Autodetect Tool or Graphics Drivers and Software Download Page. AMD Catalyst™ Drivers For A Windows® Based. Advanced Micro Devices.

1. Start computer in safe mode with networking

2. Download and install Driver Sweeper which can be obtained here

3. Start the Driver Sweeper program, check the ATI - Display box and click on the Clean button. This will delete ALL ATI drivers from your system.

4. Reboot computer again, it should start normally now if everything worked right... Now you're gonna remove any CCC program via add/remove programs.

5. Now all you have to do is find the original driver you had before you tried to upgrade. I would recommend using the disk that came with your video card. You can also go to the ATI website and search for your exact model and download the drivers... Keep in mind, I would stay away from the newest versions of drivers as they all seem pretty buggy...

The current CCC software I am running stable is: Catalyst™ Control Center Version 2010.0406.2133.36843

The current driver I have installed for my HD 4850's in crossfire mode is atikmpag.sys (8.14.1.6113)

This driver with that version of CCC hasn't failed me yet. Try not updating graphics drivers if you don't have to. If it isn't broke, don't fix it.

I really hope this helps everybody out... I got mine working again... Oh and for all of you with the black borders issue the post above mine is 100% accurate and will fix the issue.

Ati Radeon Hd 4200 Driver Windows 10

Also this is the system I am currently running:

Ati Legacy Drivers Windows 7

SPECS:

XFX HD-485X-ZNFC Radeon HD 4850 1GB 256-bit DDR3 PCI Express 2.0 x16 x2 in crossfire hooked up via HDMI cable

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