I'm not sure you're going to see a benefit from removing that stuff, and you might have some problems trying to actually remove the store (I'm not sure how deeply it's tied into user verification, etc). But I did a little google and found this...
http://www.neowin.net/forum/topic/12...nd-windows-81/
The calculator is calc.exe in the windows/system32 folder, along with sound recorder (SoundRecorder.exe)
The camera is in the windows folder in it's own directory (Camera)
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