serious windows error, need help urgently

Hi forum, sorry to be asking so many questions lately . But this is something that requires someone like you guys to help with. Ok, so about two hours ago, I turned my computer on and it came up with windows error console and asked me whether I wanted to go to startup repair or start windows normally, and I chose the obvious answer, which was startup repair. I did that with no results, and the error console came back up again and I chose the startup repair. This time when I restarted, the error console came back up, and I chose to start it like normal. When I did that, it started normal, but when it started, it came up with this error:

Code:

Faulting application name: MMLoadDrv.exe, version: 2.0.0.0, time stamp: 0x4e167bc7
Faulting module name: atiumdag.dll, version: 7.14.10.847, time stamp: 0x4e1672d1
Exception code: 0xc0000006
Fault offset: 0x00047d7b
Faulting process id: 0xb70
Faulting application start time: 0x01cc52d4b2a32019
Faulting application path: C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static\MMLoadDrv.exe
Faulting module path: C:\Windows\system32\atiumdag.dll

Now, the question here is why can I not open any program except Windows Live Messenger and Internet Explorer 8 x64, and was that error the cause? If so, how do I fix it?

Thanks forum!