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win 10 64 bit thinks firefox is running no error msg will not refresh

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running latest firefox - I think uninstalled without writing down version got the latest win 10 bug fix two days ago - yesterday was fine but this AM windows could not access the internet and the system rebooted from their end - automatic clicked on firefox Nothing but the little circle spinning loaded chrome - made it default went back to refresh - firefox already running can't re-fresh switched to Admin - now I was told firefox already running but could not get it to open on re-install attempt was told to close version already running and try again

Do you see the theme? rebooted twice

thanks for your help

running latest firefox - I think uninstalled without writing down version got the latest win 10 bug fix two days ago - yesterday was fine but this AM windows could not access the internet and the system rebooted from their end - automatic clicked on firefox Nothing but the little circle spinning loaded chrome - made it default went back to refresh - firefox already running can't re-fresh switched to Admin - now I was told firefox already running but could not get it to open on re-install attempt was told to close version already running and try again Do you see the theme? rebooted twice thanks for your help

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Did you clear the folder that was also created by FF? And which verison of FF57 did you install? And what A/V are you using along with what Firewall?