Windows 10: Lost Windows 10

I had Windows 10 on my laptop, one morning, I logged in, checked my email and logged off within 10 minutes. 4 hours later I went to log in and it said I had to enter my Recovery Key, I had never heard of that, Well I ended up doing something that deleted my files no big deal But my laptop is now a Windows 7 , I did not ask it to become a Windows 7, How do I get it back to a Windows 10, I don't have a product key. I Rented the laptop and just paid it off from Rent A Center. They told me they didn't EVER have any paperwork, and never had a product key, so how do I get this?Also it lags so bad

:)

 

Windows 10 Tweaks

Pressing “Windows+Pause Break” (it’s up there next to scroll lock) opens the “System” Window.

Windows 10: In the new version of Windows, Explorer has a section called Quick Access. This includes your frequent folders and recent files. Explorer defaults to opening this page when you open a new window. If you’d rather open the usual This PC, with links to your drives and library folders, follow these steps:

• Open a new Explorer window.
• Click View in the ribbon.
• Click Options.
• Under General, next to “Open File Explorer to:” choose “This PC.”
• Click OK

credit to Lifehacker.

 

Unlocked Realtek HD Audio Drivers Windows 7 & 8 (With Dolby Digital Live and DTS Interactive)

DTS supported natively by Windows 8/8.1 and it should work on windows 10 too just DDL require to unlock your driver .

 

Is it time for Windows 10 already?

Here's a good step by step guide on doing a fresh install.

How to clean install Windows 10 from a USB drive - Software - Feature - HEXUS.net