@lawguy
Good news, glad you solved it!
I guess there must have been something in the graphics driver installation that was causing the lag, which reinstalling it has fixed. That could have potentially caused a delay with other programs as well as Opera of course.

@scotthaddin
That's great news!
I guess we'll never know which driver was the culprit, but I'm very glad that you didn't actually have to disturb your hardware after all!

@scotthaddin
A quick search on BAD_POOL_HEADER seems to indicate that it's very likely to be caused by a physical problem with the RAM hardware.
If that is the case it could potentially happen with any software of course, not just Opera.
If you can, try removing your two RAM modules and cleaning the contacts, and the sockets' contacts. I would try putting them in the other way around to before, although that shouldn't actually make any difference of course!
See if that improves things.
If it doesn't there are some RAM tests you can do, but try the simple cleaning option first.

@lawguy
The hourglass for a brief period after you close Opera's window is almost certainly it writing its data to the hard drive before actually shutting down. If you look in the Windows Task Manager processes list, I suspect you will see that the program doesn't actually shut down as soon as you close the window, which is very common behaviour by many programs.

@scotthaddin
What's the error quoted on the BSOD screen?

@lawguy
Three seconds! I'm sure a lot of people would be delighted if anything loaded that quickly!
Seriously, have you tried Chrome? I'm not being facetious, but it could be a Chromium thing, and all Chromium-based browsers might have that lag. Edge and IE are always going to load fast, as they are optimised in the operating system, bing Microsoft products. If Chrome also has the lag, that could be the reason for the loading delay.

@ravaner
36.0.2130.80 to be exact, you can download it here.
Use the setup file.

@jepoore
The bookmarks should have all appeared in the "Imported Bookmarks" section of the bookmarks manager.
Many people (not surprisingly!) expect them to appear in the normal folder and be immediately accessible, but it doesn't work quite like that.

@pkaovil
If it works on Opera 36, which already can't open some secure sites, it should certainly work on Opera 52!
Are you saying that you can't override the certificate warning on Opera 52 and access the site(s)?
You're always going to get the warning on any browser if the certificate(s) problems are there.
Fixing the certificates themselves is surely the only permanent answer.

@fopusa
MEMORY_CORRUPTION often indicates a physical problem with the machine's RAM. The fact that opera.exe is quoted doesn't necessarily mean it's an Opera problem, any application could have potentially caused it. Is opera.exe always quoted every time, and never anything else?