Pictures in Thumbnail are different to when I open them

Ok Guys, this is for a client of mine,

I have only been working this job for about a month, but Ive been working on computers since I was 10.

Here's my client's problem:
When I open Documents/pictures his pictures are all viewed as thumbnails.
When I open the thumbnail pic the picture is something completely different (one of the other pictures in the album)

Never experienced anything like this before and I need to know how to resolve this ASAP
Thanks
 

My Computer

System One

  • Manufacturer/Model
    Self Built
    CPU
    Core2Quad Q9550 @ 2.83Ghz O.C'd to 3.86Ghz
    Motherboard
    XFX Nvidia 790i Ultra SLI
    Memory
    4x2GB Corsair DDR3@ 1333Mhz
    Graphics Card(s)
    Asus Nvidia GTX 280
    Sound Card
    Creative PCI Express X-Fi Titanium Fatal1ty Pro Series
    Monitor(s) Displays
    Benq 24in 1920x1080, Viewsonic 22in 1680x1050
    Screen Resolution
    1920x1200 + 1680x1050
    Hard Drives
    Samsungx2 750GB SATA II 32MB SATA Hard Drive RAID 0 array
    PSU
    Antec 850Watt
    Case
    Cooler Master Cosmo S 1100 Extended ATX No PSU Aluminium Blk
    Cooling
    7x 120mm Fans
    Keyboard
    Logitech Dinovo Edge, Logitech Dinovo Mini
    Mouse
    Logitech G7, Logitech G9
    Internet Speed
    24Mbit p/s

My Computer

System One

  • Manufacturer/Model
    Sony Vaio Z46GDU
    CPU
    [email protected] w/6MB L2 cache 1066MHz FSB
    Memory
    6GB DDR3 1066MHz SDRAM
    Graphics Card(s)
    9300M GS 256MB + Intel Integrated 4500MHD
    Monitor(s) Displays
    13.1" WXGA True Colour Tough
    Screen Resolution
    1600x900
    Hard Drives
    320GB SATA 7200RPM
    Internet Speed
    1MB/s
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