Hi im not so wise with computers, but here goes....
I've come back from holiday, turned on my machine, tried to open a folder on my desk top which contains mp3's, but when I double click on the folder icon, all of the icons & shortcuts on the desktop, and the tool bar at the bottom of the screen including the system tray disappear for 4 to 5 seconds leaving just my desktop wall paper, and then reappear.

This is happening...