Minimal version of XnView:
http://www.xnview.com/en/downloadwin32.html
Here's how I set it up:
Default buttons are saved in the default.bar file.
C:\Documents and Settings\[Name of User Account]\Application Data\XnView\
or
C:\WINDOWS\Application Data\XnView\
or
C:\Users\[Name of User Account]\AppData\Roaming\XnView\
Tools > Options > Keyboard/Mouse > Mouse wheel > Previous/Next file
Tools > Options > Browser > File List > UNCHECK: AI, PS, PDF files
Tools > Options > Associations > SELECT: View as Extension > .bmp .gif .giff .jpe .jpeg .jpg .pbm .png .tif .tiff
Edit > Background Color > Choose white as the color that is visible after only a part of a picture is deleted.
To preview pictures only:
XnView > Tools > Options... > View > Misc TAB > UNCHECK: Play movie and Play sound
Buttons:
Browser, Save as, Crop, Rotate, Quick Slide Show, Fullscreen, Print, Scan, Vertical Flip, Horizontal Flip, Zoom out, Zoom in, Previous File, Next File
Browser: everything except: Convert, Create Contact Sheet, Options, About