Windows 7: Volume-Mixer: DISABLE Line-In on STARTUP

Dear community,

i am expierencing some problems with my computers Line-In. I have installed a tv card, where i have to tunnel the output of the tv card to the Line-In of my computer. So far so good.
But now the problem is, the tv-card always produces a disturbing noise when DSCALER (app. I use to watch tv) is not used.
So to say whenever i startup my windows i have to enter the Volume-Mixer dialog and mute the Line-In. The mute isn't saved when i restart my computer, so after restart it is again unmuted.
Is there a solution to automatically mute Line-In whenever i startup Windows?

Here's a picture how i would like to have it: