Looks to me like someone remotly desktoped in and took pictures using your webcam. . . however this seems unlikly unless you have enemies. . . and those enemies are smart enough to do some television type stuff. . . and you have a gaping hole in your firewall. . . and you have VNC installed on your machine and have it set to not ask for your permission to have someone connect and remotly use your machine
if all of those things are true i'd worry. you may want to check your machine for spyware etc but others will have to help you from that point.
^^^ what hazelnut said. Do any of the suspect files have intact paths? If not this gets more suspicious. And do any of them have intact created or modified dates/times?
You don't by chance have some type of software that runs to support your webcam somehow do you? If so it's maybe possible this is somehow related. Built-in automated testing of image capture and saving by the software?
if this is the case, either you're playing us for fools or .... i don't know what else.
if you have no webcam than the pictures in there (those of you and your stereo equipment) must've come from a digital camera and then moved to your computer then deleted
as for the screen shot, that could well have been made by the people who built your pc to confirm that everything works (it is after all a screen shot of your specs
as hazelnut said, most eveything listed here is normal deleted items
the ones that concern you are
the screenshot
the pictures of your stereo
the pictures of yourself
however (as stated above) without a web camera I don't find these to be of concern to your computer