Thunderbird has been working fine here for many years.
windows 10 x 64
Last week, suddenly both Thunderbird and Firefox stopped working. (I'll open a Firefox thread too, as it's slightly different)
In Windows safe mode - Thunderbird works fine.
In normal Windows - Thunderbird safe mode works OK (since I loaded it in Windows safe mode).
Normal mode does not.
The thing is - it starts a process but cannot kill it. So once I load in safe mode, it won't reload, because (I think) it thinks it's already running.
Firefox does the same thing - it (sometimes) loads once, and then if you close, it won't re-open - but gives the message that the old process must be closed.
I can't kill these processes - it says "access denied".
I've tried all the re-installs etc etc - bu tit's too much of a coincidence that both Firefox and Thunderbird broke at the same time.
It must be a Windows issue.
Nothing much has changed, and the only Windows updates recently were .NET ones - which shouldn't really affect this.
The other weird thing is - I've restored images from a few weeks ago (when everything was fine) and I still get the same problem.
Has anyone seen anything like this before? Or am I on my own
I've tried all the fixes I could fine (parent.lock etc) but it basically comes down to this:
1 - both Thunderbird and Firefox, if they can be persuaded to load once, will never load again (until a reboot) because they can't kill the process from the previous load.
2 - it happened to both Thunderbird and Firefox at the exact same time.
Thanks for any ideas.
So I had issues with Kaspersky as well. It didn't allow access to secure websites (HTTPS). 
