ec. Often I have multiple things going on my desk and bump the keyboard and I "DOS" an instruction and that will change things. But if you are usign Internet explorer, up in the top right hand corner is the minimize (-) and the Max imize (box) right along side of that. That box ups and downs the size of your image on your monitor from reduced image to full screen image. Click that and see if that is what is happening.
In the lower right corner is a six dimpled triangle..if your screen is not "FULL" size, click and ohld that triangle and drag it to the far right corner, do not use the "_" "BOX" "X" d=for resizing as it will only keep the setting until you close the window, it will then revert to the smaller (or larger) size....LarryB
If you are using Internet Exploder, bring it up to "maximum" and hold down the shift key when you close the browser. It should open in a full window after that. If you shut it down in a reduced size, it remembers that as well. Just maximize it and do the shift key thing again when closing it. It works most of the time. Some of the exceptions are specific links like Window$ Update.
I dumped IE a few months back on recommendation from my IT guy. Downloaded and installed Mozilla Firefox Browser (it's free!).It seems to be more stable than IE and is very easy to use. I've been very happy with the change.