Thanks, I'm sorry for that
Basically, I've had this problem in two opportunities, now; and there isn't seem to be a reason of reference for it. Well, the first time I remember I opened Google chrome; happens that someone else allowed the installation of some adware, which came with an extension and changed the home page. Before I was able to reset the home page with the alert Chrome gives, the screen froze and it's like the computer couldn't take it so I got BSOD.
This time, I installed a program, used it for what I needed at the moment, uninstalled it and restarted. Windows got to restart until or before the 'Starting' screen, then BSOD.
I have disabled the graphics card.
Both of these blame atikmdag.sys and, since then, at the boot screen it displays green dots, like when there are 'dead'¿ pixels.
One thing to add would be is that that program installed with it, as a prerequisite, Microsoft visual c++ 2012
Sapphire Radeon HD 4650 AGP
Windows 7 Ultimate 64bit
Catalyst Software Suite 13.9
LG FLATRON L1718S 1280x1024 @60Hz VGA (DVI to VGA adapter)
Asrock 775i65G R2.0 - BIOS 3.30 version
Intel Core 2 Quad Q6600
Generic -I'd say- PSU, KTech EN60950 500W
2 GB RAM, two modules DDR400 1 GB, CL3
How long have you had your computer for? What version drivers are you running?
In general, for a long time. But when this event occurred I had installed Windows a little more than a month ago. Drivers of what? Graphics? The ones available at AMD. They have to be the latest, since this card is old too.
You could try following one of the many atikmdag.sys/atikmpag.sys "fixing" videos out there (expand the .sy_ files used for your video drivers) but my guess is that most of the issue derives from the system itself being old. I don't think I can help any more than just suggesting the above, unfortunately.