I went to start Unity today and it keeps crashing on startup with 10 days left to go on my trial. It had been working fine up until today. 
After trying a few things I uninstalled and reinstalled Unity again, but it still crashes.
It’s strange because I’ve not made any major changes to my system/drivers etc.
Maybe I got me one of those pesky virus things… Oh no…
If I solve the problem I’ll report back.
Try opening a different project (hold some modifier key at startup; on Mac it’s Alt, it may be Shift or something on Windows. alternately, rename the last project you were working on so it can’t find it.) Sometimes something can happen to project - a particular script compilation crash, for example - that does this.
It’s alt on Windows.
It didn’t help, but thanks for the suggestion (and tip!)
wooohooo! I found the problem!.
It was caused by my Saitek Rumble gamepad being plugged in!. I lazily took a peek in the crashdump file and not expecting to find anything I noticed the reference to the gamepad in the ASCII column.
Removed gamepad and BINGO! - Unity works again!