Win 98 Retail
K4HVD-Q9TJ9-6CRX9-C9G68-RQ2D3
or
hgbrm-rbk3v-m9fxv-ycxdk-v38j4
or
PTX6T-WTQ9G-C7B2Y-TC3K8-YT4GB

For Windows 98 Second Edition, its.
HQ6K2-QPC423HWDM-BF4KJ-W4XWJ

For Windows 98 Complete, which was before
Windows 98 Second Edition.
F73WT-WHD3J-CD4VR-2GWKD-T38YD

BEST OF LUCK.