Please excuse me if this has been covered - a search on "Explorer freezes" didn't get me any answers... I have been having frequent system freezes (completely frozen - requires forced power-off) when I use Windows Explorer. I use the Windowskey-E combination regularly, as well as Right-click the Start globe and open win explorer. At least 4-5 times per hour, Win 7 freezes completely. It has also happened when right-clicking a file (to copy or move), and other Explorer operations. I upgraded from Vista Ultimate 32-bit to Win7 Ultimate 32-bit on a New Dell Studio laptop. Vista had been working well. Is this a known problem? Is there a fix for this?