Adobe Audition line-in Recording Problems

I've just started using windows 7, used to and still do use on other computers windows xp.
I installed adobe audition 1.5 on the computer with windows 7.
In xp you had to select line in, in the recording control to allow you to record if something was playing in the background.
(see images in, is this what you guys were talking about? - Recording Forum - Home Recording Studio Help).

I can't seem to enable this function in 7

please help.

kind regards

Dan W

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