DRIVER_IRQL BSOD. Help!

I have recently had some BSOD problems, some stating that one of my RAM cards causes it. I have fixed that. However another "potential" threat has popped up. Although I have managed to fix my RAM BSOD problem, I cannot fix this one. I get a BSOD after some time and as always I look where the problem "description" is. It has the "DRIVER_IRQL_NOT_LESS_OR_EQUAL" problem. I decided to look around the Internet for a fix. I read that it can be caused by a Third-Party driver. I uninstalled PPJoy, whis IS a Third-Party driver. A few minutes later the BSOD pops up again. The same message again. I used BlueScreenView and saw that all of my BSOD-s have been caused by the same or identical .sys file. File description says it's an ATI Radeon Kernel Mode Driver. I do not remember using anything like this. I do have a AMD Radeon HD 6670 GPU however, whose drivers may be outdated. I have AMD Catalyst but, sadly, I do not know how to use it. So as a last resort I turned to Forums. I'm not the type to ask for help, but a problem is a problem, and must be solved. If anything is needed of me, such as to post a file or so, I will do it. I know there is another thread about this same problem, but still...