Explorer.exe

Ok. Strange problem. Since yesterday, when we use windows explorer on our 2000 server, you either have to click on the toolbar or right-click in the open window to get antyhing to show up. For example, if we open My Computer, the window opens butis blank until you right-click somewhere in that window or click on one of the toolbar buttons, then all the drives will appear. The servers hdd got moved yesterday from our old box to a new dual xeon box. Anyone ever seen anything like this before?