ok, do you have ati catalyst control center?? to check, right click>properties>settings>advanced>ati catalyst control center tab (if you have it)
all of the next steps are if you have it ati catalyst control center tab ati catalyst control center button (launch it)>if you have never launched it use the advanced view>click on monitor properties>now adjust your resolution
and i as well have the problem with installing the drivers, so if somebody knows how to fix that please let us know!!