Windows 7 has reached end of life. That mean there's no support for it anymore. Which means security vulnerabilities might not get patched. Also, third party software developers are unlikely to support it to the full extent.
My suggestion would be 3-fold:
- If the laptop came with a hard disk, you might want to replace it with an SSD. Replacing hard drive with SSD gives a major performance boost to laptops since laptop hard drives are generally quite slow. This can be done in two ways
- If your laptop has an M.2 slot which supports M.2 SSDs, you can just buy an M.2 SSD and plug it in, then install Windows on this
- If your laptop does not have an M.2 slot, you'll have to remove the hard drive and put in a SATA SSD
- If your laptop came with 4 GB RAM, then you should upgrade it to 8 GB RAM. Make sure that the RAM you get matches your current RAM module as closely as possible. There are three possibilities here (use CPU-Z to find out which one applies):
- There's a free RAM slot in your laptop: You can just buy another RAM module and plug it in
- There's only one RAM slot in your laptop. You'll have to remove the existing module and plug in a new one
- There's a soldered RAM on your motherboard. In this case, you'll be able to plug in a new module, but existing one is not replaceable at all
- You don't need to do a clean install. Windows 10 has a built in Reset option. Open settings and go to Update and Security and in there, select Recovery. There will be an option called Reset this PC. Click on Get Started. Make sure you backup your existing data.
If you want to do a clean install however, it is easier and faster to do it with a Pen drive. Take a pen drive of at least 8 GB. Download Windows Media Creation tool and run it. Point it to your pen drive and select the option named something like Create bootable media for other computers.
Once done, restart your PC. Keep an eye on the first screen which appears. It will say something like Press F9/F10 to go to the boot menu. Press the key and select the Pen drive to boot. Then proceed to do the clean install.