Photoshop Question...Help please if you can....(Marching Ants Question)

I have scanned in many photos and never had this occur until now.

Here is the problem. Previously, anytime I needed to select a section of the photo to work with I would place the cursor and click to make the crosshairs at the desired spot, then drag to create the desired size of the selection area.

Now for some reason, when I place the cursor and the desired point and click the crosshairs to begin this process ....instead of being able to create a sellected area of my choosing, I get a small selected area box (marching ants) at the point of clicking and am unable to drag and define my own selection area.

Did I accidentally set some setting or other to mess this up and...

How can I correct this problem and get back to my previous settings?

TIA

...updating my video drivers fixed it.

However, the problem might be caused by other factors.

change the default

to see if you have accidentally set the selection box area to a single value. That's happened to me.

Okasha