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Alright, the following error occures when I am trying to "Register a product I already own..." on the Play Games_Half-Life2 screen in Steam.

I enter my CD Key(it is correctly typed), and a pop-up box tells me:

"Instalation of Half-Life2 Retail Standard is required before continuing.
Please insert your Half-Life2 Retail Standard CD/DVD into the drive and select 'install' from the autorun menu."


Well, guess what? I already have installed HL2...twice in fact.

Any suggestions?


C.H.
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