How to fix the Windows Graphics
"thumb nails" on the left side of the window
It is handy to be able to view the "thumbnail" graphics on the left side of 
the windows.  But for some reason, they may no longer show up.  Here 
is how to fix it.
  - Click Start, click Run, type 
  regedit in the Open box, and then click OK.
  
- Locate and click the HKEY_CLASSES_ROOT\.jpg registry key.
  
- Right-click the HKEY_CLASSES_ROOT\.jpg registry key, 
  point to New, and then click Key. Name the 
  new key ShellEx. 
- Right-click the ShellEx registry key that you created, 
  point to New, and then click Key. Name the 
  new key {BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}. 
 Note that the { } brackets are necessary.
- Click the {BB2E617C-0920-11d1-9A0B-00C04FC2D6C1} registry 
  key that you created, right-click the Default value in the 
  right pane, click Modify, and then type the following value 
  data in the Value data box:
  {7376D660-C583-11d0-A3A5-00C04FD706EC} 

What all those numbers mean, who knows.  But 
it works.
Registry Settings for .jpg
  
    | Key |  |  | Name | Type | Data | 
  
    | .jpg |  |  | {Default) | REG_SZ | jpegfile | 
  
    |  |  |  | Content Type | REG_SZ | image/jpeg | 
  
    |  | jpegfile |  | {Default) | REG_SZ | (value not set) | 
  
    |  |  | ShellNew | {Default) | REG_SZ | (value not set) | 
  
    |  | PersistentHandler |  | {Default) | REG_SZ | {098f2470-bae0-11cd-b579-08002b30bfeb} | 
  
    |  | ShellEx |  | {Default) | REG_SZ | (value not set) | 
  
    |  |  |  | BB2E617C-0920-11d1-9A0B-00C04FC2D6C1 | REG_SZ | 7376D660-C583-11d0-A3A5-00C04FD706EC |