Windows Explorer (Vista Ultimate) won't remember size

Every time I start Explorer it displays in a "default" window size even

though the last time I used it I had resized it to almost full-screen. I

think it used to "remember" the last setting, like most Windows apps, and

come up in that setting. What happened? Did some Microsoft update alter a

Registry setting just for Explorer? I really don't want to go through the

hassle of trying to back out of 15 or 20 or so Windows Updates to find the

culprit. Yeah, I'm lazy.

I have switched to using Explorer 2 for this reason for now. Windows

Explorer is mostly used for file deletions and other quick chnges but this

postage stamp-sized default start window is getting bothersome.

Could someone tell me how I go about getting Explorer to "remember" the last

size setting?

Thanks,

Turner