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One more thing, I'm now in BIOS mode 'Legacy' instead of UEFI. Is that something that's going to cause me headaches?

Thanks

Legacy mode enables non-UEFI capable operating systems to be used it wont cause any problems.

Excellent, thanks again.

You are very welcome!

1) Run HD Tune (free version) (all drives)
HD Tune website
Post images into the thread for results on these tabs:
a) Health
b) Benchmark
c) Full error scan


2) Run Sea Tools for Windows
long generic test
Post an image of the test result into the thread
SeaTools for Windows |
Seagate
How to use SeaTools for Windows | Seagate Support US

3) Open administrative command prompt and type or copy and paste:
chkdsk /r /v
This may take hours to run so plan to run overnight.
Run on all drives using the syntax: chkdsk /r /v C: or chkdsk /r /v D: changing the drive letter to the applicable drive.

C:\Windows\system32>chkdsk /r /v
The type of the file system is NTFS.
Cannot lock current drive.

Chkdsk cannot run because the volume is in use by another
process. Would you like to schedule this volume to be
checked the next time the system restarts? (Y/N)

Type: Y
reboot


4) Use the information in this link to find the chkdsk report in the event viewer.
Copy and paste into notepad > save to desktop > post into the thread using one drive or drop box share link:
Read Chkdsk Log in Event Viewer in Windows 10 Windows 10 Performance Maintenance Tutorials
Read Chkdsk Log in Event Viewer in Windows 10

5) Open administrative command prompt and type or copy and paste:
6) sfc /scannow
7) dism /online /cleanup-image /scanhealth
8) dism /online /cleanup-image /restorehealth
9) sfc /scannow
10) chkdsk /scan
11) wmic recoveros set autoreboot = false
12) wmic recoveros set DebugInfoType = 7
13) wmic recoveros get autoreboot
14) wmic recoveros get DebugInfoType
15) bcdedit /enum {badmemory}

16) When these have completed > right click on the top bar or title bar of the administrative command prompt box > left click on edit then select all > right click on the top bar again > left click on edit then copy > paste into the thread

17) Make sure that there is no over clocking while troubleshooting

18) There are log collectors used in another forum room.
Run each V2 and DM and upload results into this thread:
BSOD - Posting Instructions

18) Make a new restore point:
Create System Restore Point in Windows 10

19) Make a free backup image using Macrium and save the image to another disk drive:
Macrium Software | Your Image is Everything
Backup and Restore with Macrium Reflect

20) Update the specs in the "My Computer" section:

System Specs - Fill in at Ten Forums
In the left corner below in your post you find 'My System Specs'.
After clicking it you can find a link a little below that says 'Update your System Spec', click on this link to get to the page where you can fill in your system specs.
System Info - See Your System Specs - Windows 7 Help Forums

Include PSU. cooler, case, peripherals and anything attached to the computer by wired or wireless (mouse, keyboard, headset, printer, xbox, USB wireless network card, etc.)