Asrock P67 Extreme 4 Gen 3 Motherboard
Corsair Vengeance 16 GB 1600MHZ Ram
XFX Radeon Double D x2 6950 2GB
Coolermaster Silent Gold Pro 800 W
Intel I7 2600k
Corsair Hydro H60
Creative Titanium Sound Blaster HD
If explorer.exe is crashing then you have an issue with Windows. Explorer.exe is the main visual (GUI) portion of Windows, which is the icons, start menu, etc.
I would recommend downloading MalwareBytes Anti-Malware and running it and removing whatever it finds.
Also go to this GUIDE posted by aford10 in regards to removing malware from your computer.
I'm having the same issues after installing Radeon HD 7750. I ran a MalwareBytes Anti-Malware scan and it detected something but even after removing I'm still having the same issue. It only happens when I try to open folders that contain videos.