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Hi I've got a little problem with the installation of the game Portal. I already installed steam and it works. When I try to install Portal i choose 'Already installed (online)' then I click on 'next'. In the next step it says 'Please close Steam before continue.'. Steam is already closed so I click on 'next'. In the following step it says that I have to run Portal once before using the second part of the script and it asks if I want to start Portal now. If I click on 'yes' there appear a frame with 'Program error'.
It says that a fatal error appeared in 'steam.exe'.

What's the reason for this and how can I solve the problem?

Does no one have an idea?

If Steam is installed you can install Portal through Steam. Go to your games library and you should see your list of games that you own. You can double click and install it.