Win 8.1 need hard media, how to know which CD to get?

I bought laptop with Win 8 on it, upgraded to 8.1...now I have corruption that requires the orignial media to help fix. I don't have a hard CD media...(wish those still came with new PCs..sigh...)

So how do I know which CD I need? Magic Jelly Bean gave me this (and more that I won't post outright)

Windows 8.1
Product Part No.: [8]X18-15
Installed from 'OEM' media

Help?

Thanks

How to clean install Windows 8.1 if you have an OEM computer with UEFI firmware (BIOS) embedded Windows 8 product key?

OR

Have you tried this? -> Reset your PC from the manufacturer recovery partition. You don't need Windows 8/8.1 DVD/USB/ISO.

http://www.eightforums.com/tutorials/2302-reset-windows-8-a.html

OPTION TWO

Reset Windows 8 or Windows 8.1 from within Windows 8 and Windows 8.1

Click to expand...

5. If you have Windows 8.1 or Windows RT 8.1

A) On the left side in PC settings, click/tap on Update & Recovery. (see screenshot below)​

​

B) On the left side in Update & Recovery, click/tap on Recovery, click/tap on the Get started button under the Remove everything and reinstall Windows section on the right side, and go to step 7 below. (see screenshot below)​

​

Click to expand...

I don't want to destroy everything I have, I just want to have the repair find the files it needs...Reset is not an option. And the fact that it's now 8.1 from the download makes it seems worse.

edit:

How to download and clean install Windows 8.1 if you have an OEM computer with UEFI firmware (BIOS) embedded Windows 8/8.1 product key? -> link

Ugh...what a mess....thanks microswift...not...

Thanks, genet, though, sincerely...