W7 extends my display every time I close my laptop's lid


I have a ThinkPad T400 and I'm dual-booting Vista and 7 (but I only really use 7). In 7, when you press Windows+P, you get 4 display options: Computer Only, Duplicate, Extend, and Projector Only. Since I just have one laptop screen, I obviously want Computer Only. But every time I close the lid (or restart), it reverts back to an Extended display, which means when I move the cursor to the right of the screen to use a scrollbar, close a maximized window, or desktop peek, I have to be precise or else the cursor will fly off the right side of the screen into my non-existent extended display.

Any ideas to fix this? Thanks.

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