All digital camera photo files include something called EXIF.
That is where the camera puts information about how the picture was taken.
That includes the Shutter speed, aperture setting and ISO setting.
Plus much more information.
Find one of the blurry photo files on your computer and right-click on the file name.
Then click on the "Details" tab on the top of the pop-up window.
Scroll down the list until you get to the "Camera Maker" and "Camera Model"
Then see what it says for "f-Stop"
That was the aperture setting when you took the photo.
If it was a sunny picture, it will be a high number like f-8 or higher.
A low light situation will usually give you low number like f-3.5 or lower
The next thing is "Exposure Time"
If it was a sunny picture, it will be a very short time like "1/500 of a second..
If it was a low light picture, it will be a bigger slice of time, like 1/60 of a second.
If the time is a bigger slice of time like 1/30, 1/15, or 1/10 of a second,
your chances of getting a blurry picture is very likely, because you can not hold the camera still enough unless you use a tripod.
The next important item is "ISO speed".
A low number like ISO-50 or 100 means it was likely a sunny picture.
A high number like ISO-800 means it was likely a low light picture.
A photo with a high ISO setting will likely have more noise than a lower setting.
However, your camera (K10D) can go as high as 1600 with little (if any) noise.
The other cause of blurring is called "subject blur".
That means the target of the photo is moving, running, etc.
Most of the photo will be sharp, but only the moving part of the target will be blurred.
You need a faster shutter speed (like 1/1000 of a second).