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You can always try and find out 😉 . Press & hold the shift key at startup. If indeed a system file is gone (which it shouldntn be), do an A&I.
 
eh no thx but is there a way where I can run a scan of the computer and have it install back whatever I deleted or screwed up. I deleted a whole bunch of stuff I thought I didn't need yesterday and I need a way to find out if I screw up any of the system file or not.
 
Well is the system runnning normally? I don't think there is an option, but an archive and install should do the trick.
 
Not really, it boots with some stuff turned off.

What is Safe Mode?

Stuff that can be messing with your system ... which will allow you to go in and turn off and delete the nasty files.

Missing files that crash the OS, might still crash in safe mode if they are Apple files. If they are 3rd party files, you should get a chance to fix things.
 
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