All applications are crashing every 30 minutes or so

Mysterious problem - applications on my HP laptop crash every 30-45 minutes or so and it does not seem to depend on what application(s) are running. I get different error messages depending on which application is crashing. Can anybody help me troubleshoot? Not sure what to do. . . Windows Version 1809 (OS Build 17763.973)

Thanks very much for the reply!

a. It started happening about a week ago when I noticed that tabs in Firefox kept spontaneously crashing and giving “Gah your tab just crashed errors.” It does not happen right away, but after a half hour or hour so Firefox becomes “unstable” and the tabs keep crashing. Just closing and restarting Firefox does not fix the problem, but if I reboot Firefox works OK for another half hour or so and then becomes unstable again. I tried a few of the remedies suggested for this Firefox problem I found online, but they did not fix the problem. I did notice that my virus and threat protection under Windows Defender was giving me a “your virus and threat protection is managed by your organization” error so maybe I got a virus or malware or something? I fixed that and it appears to be running fine now. I am running Norton and I ran a full disk scan, but it found no security risks. Then I tried using Edge instead of Firefox but again found that after an hour or so it would crash. I do not get a BSoD, but get a blank screen with a tiny little icon in the middle and it is just frozen and I have to reboot. After rebooting it behaves for an hour or hour or so and then crashes begin again. Next I found that VLC media player was spontaneously crashing after a half hour or hour or so. Those are the only 3 applications I have run since the problem started, but they are all behaving wonky.

b. I ran HD Tune 2.55 and it showed all OK and no damaged blocks. I ran chkdsk from the admin command prompt and it found no problems.

c. I have not made any changes since this is started that I can think of – no new software installs or anything. Just business as usual.
d. Alas, I am afraid I do not have a disk image from before the problem started.
e. I ran Windows Memory Diagnostic to check RAM – it found no memory errors.

f. I did a clean boot and started using it. It was behaving itself pretty well, but after just under 2 hours Firefox tabs have started crashing again. 7 minutes later Edge crashed with an error saying “SegurazoClient.exe System Error. Unknown Hard Error.” And then a few minutes later VLC media player crashed.
g. I am not getting any BSoD

Please see this: https://forums.malwarebytes.com/topi...-for-segurazo/

Segurazo is a "system optimizer". These so-called "system optimizers" use intentional false positives to convince users that their systems have problems. Then they try to sell you their software, claiming it will remove these problems

Thanks. I tried logging in as a new "test" user and the same thing happened. This time I got an error message saying "The exception breakpoint. A breakpoint has been reached. (0x80000003) occurred in the application at location 0x00007FFFF340B785." I next tried booting to safe mode (selecting F5, Safe Mode with Networking), but it is not connecting to the internet in this mode so I can't test the browsers. I also tried rebooting and running on battery instead of having it plugged in - this also made no difference and it did the same thing.

Did you stop the process (you should have been given 2 choices)? What is the location of 0x00007FFFF340B785?
Altho' you've done most things listed here, it describes what has happened and what to do: [SOLVED] Exception Breakpoint 0x80000003: Breakpoint Reached!

You need to work out the time it could be getting to hot check temp it could be a shedule task have you run a malware scan and sfc /scannow

Thank you for the continued help, everybody, and thanks for pointing out the solution to the Exception Breakpoint error. I tried solutions 2 and 3 earlier, but not solution 1. I just ran the system file checker scan (sfc /scannow) in solution 1 as directed. After running, it reported that it found corrupt files and successfully repaired them. I rebooted, but unfortunately it has still not solved the problem - after a couple hours things are crashing again and eventually the whole system freezes and must be rebooted - same thing.

I did do a full scan with my Norton security software and it did not find any security threats - would that be the malware search you suggested?

How do I check temperature?

Thanks again, everybody!