Trying to sort a machine out, i've cleared the dozen or so viruses, but for some reason the images in internet explorer, firefox and opera all appear to be 16-bit (ish)

Regular photographs that are loaded form a memory card are fine, just internet images.
Any ideas?
edit, machine is running vista 32bit, geforce 6150, 1440x900 (changing res has no effect)

Regular photographs that are loaded form a memory card are fine, just internet images.
Any ideas?
edit, machine is running vista 32bit, geforce 6150, 1440x900 (changing res has no effect)
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