Most new computers have a restore function where you can restore your computer settings to an earlier date.I would also try rolling back my video drivers or uninstalling and then reinstalling my video drivers if I were you.
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I already did answer this? But I forgot the point, If your lens is dirty (must be bad) you only can clean it with a special lens pen or a micro five cloth, if a special fluid is used. Never clean lenses with anything else, because the coating on the lens is easy damaged. When the coating is damaged, you never will get any clear pictures os videos.
Your camera has a feature called MF (Manual Focus) if it is switched to MF, the autofocus won\'t work. If on the right side of the screen is MF, you are sure the camera is in that mode. You can change that in Recording Menu 2.
Blurred images can have different reasons. Greasy lens, camera shake or focus error.
You can clean a greasy lens with a lens-cleaner solution and lens-paper. Camera shake will (most likely) only occur on images taken without the flash. Most likely there will be a warning on the display if risk of shake. it's a hand with an "!". Focus error will usually also give a warning in the display.
Seem like blocked hole(s) on the color print head...
Most likely if there is a deep clean option then do it (may need a few times to unblock a hole or never).
Also get the printer physically cleaned up if you can see dusts inside (vrtical lines on color bars).
Which mode are you shooting in? You may have adjusted the exposure compensation so everything is washed out.
Whatever the cause, your images are overexposed. Try shooting in auto and the camera should take over the settings, but if you are in other modes, check your shutter speed, aperture, & ISO also. These are all things that can cause too much light and wash the picture out/OVEREXPOSE.
If you have any other questions or can give me more details, just ask!