The first screen seems to indicate a watchdog timeout which tends to be either a bad driver or faulty hardware. This error occurs when a driver takes too long to respond. Loading the .dmp file into a debugger (Windbg for example) can help analysis the actual error and what is likely causing it. If your machine is older then it could be something as simple as dust buildup causing the hardware to have issue, or it could be hardware going bad. If you recently installed new/updated drivers then it could be bad drivers.
The second screen relates to Explorer crashing. In general Explorer crashing isn't going to cause a BSOD. It may cause your desktop to disappear but pressing F5 would cause it to come back. Explorer crashing can be caused by a bad shell extension or a faulty file system driver. By itself it won't cause Windows to crash.