Somehow I got Baldur's Gate to play in a window last night, and I cannot figure out how to make it back to full screen. Could anyone out there help me?

Press the 'h' button.

Doesn't seem to be working Lord. What happend was I minimized the game and then when I double clicked on it when it was on the task bar and it came up as a little window. It's been that way ever since.

Try:
_Hit Alt+Enter
or:
_go to the config program and change it there.

Alt enter worked! Thanks!

Oh, now I know what you mean. I thought you meant you wanted to play the game in full screen as in take away the panels around the playing screen. 'H' hides those panel interfaces, but I guess that's not what you wanted ;) .

"H" to hide the panels is only in BG2.