[AlanHK]

I have been using Sigil for a few months.
Yesterday when I tried to start it it just failed to launch.
In Process Explorer I see it start then exit a second later.

I uninstalled and reinstalled it.
Rebooted the PC.
I had 0.72, tried 0.74 and the same result.

I have Avast AV, but don't think that is the problem, I turned it off briefly and Sigil still failed to open.

Possibly there has been a Windows update since I last used Sigil (I know XP has recently stopped updating).