I bought 10 of the A530 models for my school. It’s the same thing only 5 MP and only 10 fps in the 640x480 movie mode, etc. The only times I’ve ever seen them not take a focused picture is when students press the shutter button all the way down in one motion. Remember to press it halfway, wait for the little green focus box to appear on the R2 part that you want in focus, and then press the rest of the way. Low light and camera shake could be an issue too; best solved with more light or a tripod. If you are going to shoot a lot in your work area, install a bunch of cheap lights.
One of my students just bought an A560 on sale for $170; that’s a heck of a lot of camera for that price. Your camera has a great 15 fps 640x480 movie mode. Use it, you will be impressed.