if you have access to another PC (library can work wonders), a valid windows 7 key (probably on a sticker on the bottom of your laptop) and an 8gb or larger usb drive you download whats called an ISO (basically its a CD/DVD in a single file that you can store on a hard drive) here
https/www.microsoft.com/en-us/software-download/windows7
then you can either burn the ISO onto a DVD with a blank DVD
http/windows.microsoft.com/en-us/windows7/burn-a-cd-or-dvd-from-an-iso-file
or you can use a tool from Microsoft to copy the ISO to a USB drive (must be 8gb or larger)
https/www.microsoft.com/en-us/download/windows-usb-dvd-download-tool
once you have a DVD or USB drive with the ISO on it you simply insert either into your laptop, turn it on and press the select boot device key
usually its del, escape, f12, f8, f10, or some other key. if it doesn't say "press "del/f12 est" to select boot device" on the bios splash screen (the first text that pops up when you start your PC) disable quick boot in the bios and it should then display the prompt when you first turn your laptop on.
or go into the bios and set the boot device order so that the DVD drive/USB drive is the first boot device and restart your PC. it may ask you to "press any key to boot from DVD/USB" so press any key if it does.
if it works it should bring up a "windows loading" screen for a minute or two and then it will start the windows installation process.
its pretty straightforward just take your time to read everything on the screen.
make sure to select the version that you had before so your CD key works properly (IE professional/enterprise/home est), this should be listed next to the CD key on the sticker.
make sure to select your SSD (should be the largest drive available) as the location for windows to install, to simply reinstall windows without deleting your old data.
it will move your old user data to a folder on the C drive called "windows.old" and you would have to navigate through
C:\windows.old->users->(your old user name)
and that will contain all your old documents, saved games est that you saved under like "my documents" for example. otherwise it wont delete or remove anything on the drive.
this video explains how to reinstall without formatting the old drive. for reference.
https/www.youtube.com/watch?v=zM_ePgOR4wo
IF windows setup cannot see the SSD in the install process you will have to replace it with another drive to begin troubleshooting the hardware, which basically means if a different HDD/SSD drive works and doesn't cause trouble later its probably your SSD.
this is what a "clean" installation looks like (formatting a new drive for windows)
https/www.youtube.com/watch?v=mME9VLT7-xw