I bought in December a SAPPHIRE HD5770 1GB DDR5 CG: My current driver is Catalyst 11.2 which date from February 2011. When searching for a Shift, I discovered it existed on Catalyst 3.11 driver dating from 03.29.2011. This driver is available on the ATI / AMD I downloaded this, I install it. The installation goes to completion, then an error message saying that no driver is installed or the one who is not working properly. I restart the PC and then at the bottom of the screen, a horizontal black stripe occupying one third of the screen appears. That is a band that hides part of the screen and not going back display. Please help me here as soon as it is possible for you guys.
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