Thank you all for your attempts to help my strange problem.
And......it's fixed. I don't have a clue what the hell one of us did, but after much screwing around, it's ok. I eventually got the white square down to one very small square up at the very top of my screen. After some web surfing, I went back to the wallpaper and instead of a white square being there, it was a little box that looked like a web page that was sized down to a one inch square. I clicked and dragged and made it wider and longer and it was the MSN homepage. It stayed behind the icons, and clicking on the icons still opened the programs as usual, clicking on different stories on the MSN page opened them too, I just couldn't get it to close. There wasn't a "X" at the top right to click on, and when I pressed Ctl-Alt-Del, it showed no programs open or running. After a whole lot more screwing around, the "X" finally appeared and I closed it.
??????????????????
