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You will have to buy a new license for the new account.
https://help.steampowered.com/en/wizard/HelpWithLogin
You seem to have said you only tried installing from the CD. But there should be keys that you can activate. I assume that you mentiond another account that you did activate them already, but just asking.
If so, please ignore this, and do as the good Bear said above.
EDIT...I guess you did activate them on the other account, from this above :
So excuse me, but you should be able to recover that old account and they will still be activated on it and play them that way.
Recovering a Lost or Forgotten Steam Account
https://support.steampowered.com/kb_article.php?ref=5421-QTFB-3090