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ValveTime.co.uk | Valve News, Forums, Steam
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.