Yes I would remove Irfanview and install it again. Hard to believe the photos have gone fuzzy for no reason. Somehow the settings may have been changed and you cannot find your way back to the default settings.

Did you download the plugins when you got Irfanview? Not that the plugins are anything to do with the problem but they are an important part of the program's capabilities

I have jpg's from 5 years ago and notice the newer digital camera images are a huge improvement ~~ these old photos do look out of focus.
Keeping the monitor clean helps but my poorer eyesight is not as fixable.

owbist, thanks for your reply and help.
on the plugins tab
I only have the radio button turned on for
"Load Preview image only.(fastest option)
There are two more options that I do not have the radio button turned on.

I will uninstall and reinstall and see if that helps.
Should I turn on the other two radio buttons under the default tab?

iris gal
I just cleaned the monitor. I have good eye sight with my computer glasses. Try them they are great for old eyes.
I don't think it is the camera, the photos look good on the camera when I check them.

Here I go to uninstall and reinstall! yuk~

Happy Paths to you in 2007

pinecone

Pinecone is it possible your video card settings need adjusting? Do these photos look odd in the Windows Photo Viewer as well as in Irfanview? To see if it is the video card do this.

Right click on an open area of the desktop
Click Properties
Click the Settings tab
Now look to see how many colours are selected and the resolution for your monitor. The colours should be 16 0r 32 bit and the resoluton depends on your monitor.