Hello, I'm going to try to explain the problem I've encountered the best I can. First of all I'll post my specs: AMD64 2800 Asus K2M-VM AM2 motherboard Nvidia GeForce 6800 Dual screen setup SATA drives I've just made a fresh install of Windows 7 Professional x64 (RTM). Everything seems to work fine so far, except that after the greyed screen tells me that something is about to change (I guess the security warning; don't really know what to call it), the background goes black. Gadgets, the taskbar and active windows are still visible along with the desktop space immediately around them. However I either have to press the start menu a couple of times or move my windows around to clear the black areas and see my desktop normally again. For some reason the desktop is not refreshing and appears black after the security warning semi-opaque screen, but does not mess up any functionnal stuff. I get this problem consistently every time the semi-opaque screen appears. I don't really know where to look for a solution and couldn't find anything relevant on the net aside from a knowledgebase entry on Microsoft support regarding the same (or similar description of the problem, though the actions performed are not the same) issue on Vista ( The Windows Vista desktop appears black after you enable the "Hide and disable all items on the desktop" policy setting or the "Disable all items" policy setting ). Any help on this would be greatly appreciated. Thank you very much.