I actually like my bitmaps showing up that way -- that is how I always set up my computers. I prefer the icons to look like, well, icons.

These are controlled in the registry. Both of these depend on whether or not you have ever "reassociated" the file extensions with different programs. I will give you the default assocaitions. You can verify the basic associations by checking to make sure the (Default) values are as follows:

HKEY_CLASSES_ROOT\.bmp
(Default)=Paint.Picture

HKEY_CLASSES_ROOT\.ico
(Default)=icofile

One those are verified to be correct, you can then adjust the icon settings:

Bitmaps:

HKEY_CLASSES_ROOT\Paint.Picture\DefaultIcon
(Default)=

The (Default) value here determines the icon. "1%" means the bitmap is displayed as a small image. There maybe a second entry under (Default) named "BackUpDefaultIcon". On my box, this points to: "C:\Progra~1\Access~1\MSPAINT.EXE,1".

So, if you want to original "paint" icon back, change the (Default) value to point to "Path to your Paint Program's executable,1".

Icon Files:

HKEY_CLASSES_ROOT\icofile\DefaultIcon
(Default)=

To have the icon itself displayed, again set this to "%1". For any other icon, set the path to the executable and add the icon number afterwards. I really don't know what the default ".jpg file symbol" is -- my computers are rarely kept at the defaults on anything!;)