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I have used a windows 98 code: RC7JH-VTKHG-RVKWJ-HBC3T-FWGBG
Thanks didn't expect it to work.
This code works for Win 98 SE on VBox
I have these couple:
Windows 2000: G74HG-XXQTJ-RTX64-QKP3F-HKHXP
Windows 98 (Don't exactly remember what version): K4HVD-Q9TJ9-6CRX9-C9G68-RQ2D3
(Update) Found this for windows 2000: TRQTT-8DRR2-7FMH9-T8R9T-DP4VD