Multiple BSODs

I've been experiencing BSODs for the last couple of weeks. The causes are often different.

I just found this forum today and I hope I have uploaded the correct W7F zip file with the dump files.

I have two external hard drives permanently plugged in so that I can back up files to them easily throughout the day. They have been plugged in for many months without problem, but obviously I would unplugg them if they were the issue.

I hope someone can help.

Many thanks in advance.