The differences in the BSOD's can be due to a number of different causes. It all depends upon the types of errors that you're getting. When there's no other evidence to the contrary, a number of varying BSOD reports could be indicative of a hardware failure.
In your case the Bad Pool Caller and Memory Management errors suggest a problem with your Memory.
The PAGE FAULT IN A NONPAGED AREA and IRQL NOT LESS THAN EQUAL suggest a driver improperly accessing memory
Then the System Service Exception suggests that there may be a system service that's accessing a driver improperly - thereby causing the error.
But that's all just speculation until the memory dumps have been analyzed.
Interestingly you mention 5 different kinds of memory dumps - but only 4 have been uploaded. Could you please upload the other one (the Bad Pool Caller)?
Of the 4 memory dump files, one reports issues with your networking - so I'd suggest updating your network drivers.
BlueScreenView shows the presence of NTFS.SYS in the stack of one of the BSOD's (not confirmed by WinDbg). So, to be sure, please do the following:
1 - CHKDSK /R
Run CHKDSK /R from an elevated (Run as adminstrator) Command Prompt.
When it tells you it can't do it right now - and asks you if you'd like to do it at the next reboot - answer Y (for Yes) and press Enter. Then reboot and let the test run. It may take a while for it to run, but keep an occasional eye on it to see if it generates any errors. Elevated Command Prompt
Go to Start and type in "cmd.exe" (without the quotes)
At the top of the Search Box, right click on Cmd.exe and select "Run as administrator" CHKDSK LogFile
Go to Start and type in "eventvwr.msc" (without the quotes) and press Enter
Expand the Windows logs heading, then select the Application log file entry.
Double click on the Source column header.
Scroll down the list until you find the Chkdsk entry.
Copy/paste the results into your next post.
2 - Please run a free hard drive diagnostic: HD Diagnostic