Recently, I have been having a problem with Oculus, Every time I try to start Oculus an error pops up saying "Your Oculus software might be updating. Please wait a minute and try again. If the issue continues, contact Oculus Support." This has been happening since yesterday.
Go into microsoft services, find "Oculus VR Runtime Service" and either start, or restart the service. If that doesn't work try restarting your computer, I'm kind of in the same boat except for some reason that simple fix I knew isn't working.
It's because of an expired certificate (March 7th 2018, 1 PM), unfortunately. We'll have to wait for Oculus to fix, or you can temporarily change the date of your PC to something before that date then restart your PC.
EDIT: Removed time change workaround as it may have negative consequences with other applications.