Windows 10: How can I install my camera file if it's missing or gone from my computer?

My computer's Camera shows no file whatsoever of its existence on my computer. I don't know how to install it back or recover the file. It's not on my trash or even shows up on Device Manager as it should be. I tried all the methods and looked for a downloadable file to restore my camera but I don't trust the websites. The error message it shows is: "0xA00F4244<NoCamerasAreAttached>" My computer is a Lenovo ideapad 3-15ITL05 Laptop- Type 81X8

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Why did the startup window get cleared?

I didn't missed any step, the list was gone and gone , even after using lot of programs the programs were not listed in that list.

 

Missing apps: Store, People, Photos, Games & Camera on upgrading to 10

Thanks for replying spunk. That's the 'alphabetical' list I was referring to, none of these apps are in that 'All apps' list. Any more suggestions?

 

windows xp installation and dual core am

could someone please list the steps they follow to install windows with a dual core processor and windows xp service pack to. I'm reletively new to amd dual core and i feel i'm missing a step. All help will be appreciated. thanx