PC Crash Today After Notification To Restart. Any Help?

I had a major crash this afternoon after Bitdefender advised an update has happen and needs a restart. The pc would then not boot correctly. I also now done a window 11 update. I seem to have got the pc working again but when I look at the bitdefender window it says error not found next to the logo.and on the support centre page it shows the same.anyone else had issues, know if there are further problems?