OS X :: Files Saved To Desktop Not Visible

I recently discovered that files saved onto desktop would not be visible. Whenever I save a photoshop document, recieve an adium file transfer, or take a screenshot with command shift 3, etc., it does not show on the desktop. However, if I drag and drop files from other folders onto the desktop or drag a picture in firefox onto the desktop, it shows.

I've tried these but the files wouldn't show:
-Sorting files by filename in the view options.
-Opening the desktop folder in finder.
-Renaming the files in terminal.

When I do these, the files would show:
-Restart the computer.
-If I list the desktop directory in terminal with the ls command, the files are visible.
-Move the file in terminal to another directory, the file is visible with finder.
-Dragging the above file onto desktop, the file shows.

I recently installed WinXP with bootcamp, wonder if that caused the problem.