I have a dell inspiron and i tried to reboot/format what ever you want to say to clean the files but as in the title i booted the wrong device by pressing f8 on startup i didnt mean to press devices but i did but when i tried to press back i pressed a random usb device and so my pc doesnt know how to react so it tries to boot up fails and restarts and i have no windows disks and other stuff like that so i wanna know how to revert what i did