Re: videos
Hi Deanie,
I assume you mean the video's that are displayed when you open the video app and not your own? As your probably aware these are nothing more than links really and so thats perhaps why you cannot find them on your machine. If you would rather just see your video's displayed then open the video app, place the cursor in the top right or bottom right of your screen and click settings from the revealed charms. If you click 'preferences' you'll see this:

I've arrowed the setting you need to change. Once done, you will only see your own collection when opening the app.
Operating System Windows 8 Pro
OS Service Pack Not yet
Internet Explorer Version 10
DirectX Version 11
Computer Type Custom build/Black Edition
CPU Type and Speed AMD FX 8150 @ 4.2GHz
CPU Cooling Sunbeam core contact
CPU Idle Temp 21c
CPU Load Temp 55c
Motherboard Chipset 990FX/950SB
System BIOS Revision FFa
System Memory Type DDR3 Corsair XMS3
System Memory Speed 1333MHz
System Memory Clocking 9.9.9.24
Video Card Type and Speed EVGA GTX 680 2GB
Video Card Cooling Stock
Video Card Temperature 35c idle/70c max load
Video 3DMark Score 3Dmark 11: 9020
Power Supply Unit (PSU) OCZ 600W modular
Computer Monitor 20" LED
Sound Card Realtek HD 108db
Speakers Dell 2:1
Headset/Microphone Logitec
Storage Controller AMD
Hard Drive 500GB RAID 0 (2x250GB)/1x75GB
Optical Drives Samsung Writemaster DVDRW
Keyboard and Mouse Advent Keyboard and Roccat Kona XTD Mouse
Modem-Router Type BT router
Network Adapter Realtek 8111B chip (10/100/1000 Mbit)
Printer HP B110a
Network Speed Too slow
USB Controller Etron USB3
Gaming Console PC Gamer!
Anti-virus Software Defender/Malwarebytes
Productivity Suite Office 13
System Install Date 2013
Computer Skill Level Self-Taught Expert
Windows Experience Index 5.9
Favorite Game Skyrim, Crysis, FEAR & many more
Favorite Application skype