Windows 10: Laptop administrator missing

I am trying to load some new software onto my granddaughters laptop Adobe PS and I have discovered that there is apparently no administrator MS wants permission to load the software. I have searched for a way round this but am at a loss. The Laptop was set up by her father who has forgotten how he did it!There are three users on the system, two humans and the actual Laptop ASUS. I read that you could "force" the Laptop into safe mode and then change the profile of one of the "humans" to administrator. However when I get to the point of entering Safe Mode I get a message that only adminis

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Administrator level User

Got the laptop. It's a Lenovo G500 so possibly has Lenovo stuff in the way? Anyway, booted it normally and it opens into a regular account without admin privileges. Rebooted it into Recovery mode (per Option 5) and get Lenovo logo and Preparing Automatic Repair message; then Select Account + "You need to sign in as an administrator to continue but there aren't any administrator accounts on this PC". There is an option "Forgot your password or don't see your account?" but selecting that brings up a screen which should list admin accounts but there aren't any. Pressing the only option on that page Restart leads eventually to a BSOD with Stop code: 0xc00002e3 (which I know is misconfigured o/s or missing or damaged system files).

Can anybody suggest next steps in resolving this?

 

Best laptop under $800??

Well the last one I suggested seems to be the best for 650$

EDIT: to facilitate your search...

Laptop GFX benchmark list

Laptop CPU Benchmark list

 

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.