Instead of getting a Windows 8 recovery disk to fix my PC, would it be possible for me to just reinstall Windows 7 instead of fixing win. 8?

Check computer hardware is upto running Windows 10. Upgrade memory and do installation Probably with compatibility mode.

Support has ended for 8 and will end for 7 in January, I would recommend you move on to 10, or something else.

Now you should consider an alternative. Do you really have some "specific" need for windows? If not- consider Linux Mint or Ubuntu, and there are several others that replace windows well. There are many Linux distros (os's) out there, and several are made especially for people escaping windows. I tried Ubuntu in 2008....it was so easy, and trouble free.....I never looked back to windows.

as long as you have a legal windows 7 licence code then sure go for it, windows 7 is much better than windows 8

If it came with windows 8, you need to use windows 8. There are rarely drivers for older operating systems, and installing Win 7 might cause more problems then it fixes.

You can download a win 8 recovery for free from MS's site.

You still use Windows 8, Why not get Windows 10?

If you have a valid Windows 7 key, sure.

If your computer came pre-installed with Windows 8 then that key is only good for that however. In addition, you may run into driver issues as there may not be Windows 7 compatible drivers for it. A generic Windows 7 installation won't have any of your manufacturer's custom drivers, and your manufacturer probably won't bother making custom drivers for older Windows versions than the system shipped with.