How do I give myself "administrator permission" to move files on my own laptop?

EDIT TO ADD: I don't think you are using THE Admin account. The fact that you're logging into YOUR account proves this.  THE administrator account is called ADMINISTRATOR and unless you renamed the administrator account, it still exists. It may be disabled, but it would still be there. Try this: 
Select “Start” and type “CMD“.
Right-click “Command Prompt” then choose “Run as administrator“.
If prompted, enter a username and password that grants admin rights to the computer.
Type: net user administrator /active:yes [enter]
type: net user administrator password [enter]
This will enable the administrator account and give it the password of 'password.'

 Orig Response: You can give yourself Admin privileges by logging in as the Admin and then elevating your account by including it in the Admin Group.  
As for temp files, I would run a full surface scan (Chkdsk /r) as well as a file system scan (sfc /scannow)  Files in temp folders can usually be deleted, but first you need to know what created them and why.  Temporary File holds information or data temporarily while the file is being created. These files are closed and deleted by Windows when you quit a Windows session. However, if you quit Windows in an irregular way (for example, restarting the computer or turning it off during an active Windows session), the files are not closed or deleted.

log on as administrator and give your username admin powers