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Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Yes, if you got an email stating an update was available, see if the link directed you to an HP.com site. If it didn't it was a fake, and your PC is infected and afflicted with something if you downloaded from the non-HP site.
It can be reversed, hopefully. Boot up in Safe Mode, choose to Restore your computer to a previous time, and select a time *before* the download-and-install was done, e.g. 1 day previous. (Be sure that it is a 'system restore' operation you choose, not a 'system refresh' or the like... those other functions may erase your computer and all your data that is on it.)
If you need instructions on how to do so, let me know.