Okay, I've tried searching for an answer to this problem on this forum as well as many others and have yet to find a solution that works for me. I use a Sony Vaio Model VGC-RB45G with Windows XP Media Center Edition Version 2002. I can drag windows, drag a cursor to highlight text and drag a scroll bar around but for some reason I cannot drag icons within windows or on the desktop. The strange thing is that the translucent version of the icon that appears when you are mid-drag and haven't dropped it yet seems to appear for a moment and then disappears. The mouse, a Sony mouse that came with the computer, appears to be working fine since dragging seems to work in some cases but not in others. I ran Norton Anti-Virus and it came up with nothing. Any suggestions as to what the problem might be would be greatly appreciated.