First, great work @Claymore!
But I face one problem ... if I mine with two instances and use for both the "-stripe" option, in my case, one instance for AMD and one instance for nVidia, the miner post the "driver in use" failure message by start the second instance. And then the miner will not use the additional speed increasing for the second instance at all.
Is that already known?
There is no way to fix it currently, two miner instances cannot use same driver at once.
what '-driver install' do?
*Driver installed successfully
*reboot
*GPU-Z show the same driver version

This option installs/uninstalls the miner driver, not AMD video driver.