I have the Sound Solution 1.1 Plugin for Winamp ...

Can i do that the plug will work on the LINE IN of the computer too?

yes you can!
there in line in plugin for winamp. google sound solution and youll find it. also, upgrade to v1.31, cause it's better. you also need to tweak it to get a decent sound. Try my preset: www.antronx.com/ss5.dat put this file into your winamp program folder. preset will be #5.

I've tried line in...it doesn't work for me

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actually, i never tried it, but i did spend weeks trying to come up with a perfect preset for it, to use for internet radio.