Why won't firefox open?

When I went to use the computer it had restarted during the night. There was a message that some updates had failed. I ignored that and tried to open Firefox. Got this error message

I ran malware and also ran up dates. I also restored my computer to the 14th. I’m still getting that error message.

I think I have Windows XP, but I’m not sure how to find out for sure. Used to be I could right click on the desk top and find out, but apparently I can’t do that any more.