ORAC is absolutely right in his first post.
To clarify a few points that seem to have got a bit murky:
1) You can only "Upgrade" an existing win 98 / 98SE / ME installation to XP - either by upgrading in situ or presenting the original CD / Diskette for verification of the upgrade during a fresh install.
2) You CANNOT use an UPGRADE version of XP to do a fresh install without original win 98 / 98SE / ME media.
3) You MUST not use the XP media from one PC to install an unlicensed copy on another PC. You MUST buy the appropriate license version for your circumstances - if you cannot legitimately Upgrade, then you cannot buy an Upgrade license.
To do otherwise is a breach of copyright.
This is of course the official line - should you find a way to circumvent the copyright laws there is very little to hinder or stop you. However, it is contrary to PPRuNe policy to be seen to aid or encourage such lawbreaking.
SD