Screen says secure boot violation in a red text box. says invalid signature detected. Check boot set

[Fannykal]

Screen says secure boot violation in a red text box. says invalid signature detected. Check boot policy in set up.

just had this message when I turned it on . I’m using the family computer and I recently download fortnite the night before maybe that’s why? Babur I’ve watched a lot of videos and I don’t know what to do, I don’t want to destroy the computer by putting random settings.

the model is HP All-in-One 24-f0023na. Product is 

4DW95EA. 

Thank you in advance.

[BeemerBiker]

Can you log into windows? 

If so, run your antivirus

If you antivirus is out of date then run both of the following

.

Microsoft has a safety scanner you can try
https://learn.microsoft.com/en-us/defender-endpoint/safety-scanner-download

Scan for "Malicious" software. Generally speaking this is software that is not considered a virus or trojan. It performs unwanted functions such as downloading newer advertisements or reporting what the users is looking to buy and offering alternative suggestions. Typically free games have these apps.
Type MRT in the windows search bar.

You can submit suspicious files or websites here
https://www.virustotal.com/gui/home/upload

Let me know if you cannot get into windows.