I have a Windows 7 Pro based system using a pair of Radeon 4350 video cards to drive dual HP ZR2440W monitors (1920 x 1200 resolution). Most of the time it works fine, but occasionally I will find that when windows overlap on the screen, remnants of one window may reside in the other -- even after the offending window is moved or closed. It seems to happen most often (but not exclusively) with Microsoft Word 2003. Windows says that the Radeon and HP drivers are the latest available. Any ideas for a cure? THanks.