I only looked at your first 5 dumps:
Two times your minidumps cited 0x7E errors:
SYSTEM_THREAD_EXCEPTION_NOT_HANDLED
A system thread generated an exception which the error handler did not catch. There are numerous individual causes for this problem, including hardware incompatibility, a faulty device driver or system service, or some software issues.
The particular driver noted is WINDRVR.SYS and is the press WinDriver Device Driver 5.05b or WinDriver Device Driver 5.22b belongs to the software WinDriver Device Driver or WinDriver Kernel Module by Jungo or KRFTech.
* I am not sure if you installed this or DELL did. It could and can be legitimate but some malware has been known to mimic. here is a link to read more.
http://www.jungo.com/st/windriver.html
Your three remaining minidumps point to 0x80 errors: NMI_HARDWARE_FAILURE
This information is from auhma.org -
This general indication of a hardware failure is often quite difficult to pin down. Follow usual hardware troubleshooting protocols, in particular: Roll-back any recent hardware or driver changes; ensure that RAM sticks are matched and undamaged; check for viruses or hard drive damage; run ChkDsk to identify file system problems; ensure that all connections are sound inside the computer and all cards well-seated. In tough cases you may need to consult a professional shop for hardware diagnosis and repair.
The driver cited in all three is ele5132,sys and there is very little on this but what I could find is that it points to the NIC card. if you have updated all drivers but your NIC card is damaged then you need to replace it.