Dear friends,
DELL OEM Radeon HD 7570 and my 3 days nightmare finally solved!!
That's how i installed drivers on nvida chipset mainboard Acer Aspire x3400 - feels like a miracle
I hope this will help you to.
http://www2.ati.com/drivers/auto/autodetectutility.exe
for me it chose: catalyst-omega-14.12-without-dotnet45-win7-64
while downloading this file there is a reminder with a link to download chipset drivers. Get that too and install first.
Then I installed catalyst-omega-14.12 and after reboot run Catalyst Center where you change resolution.
In device manager it comes as Radeon 7000 series and works its ass off
)
Hope it helps!
ps. if you go to far with resolution or frequency and loose vision, boot system F8 and start 'low resolution' option to fix parameters!
good luck! ps2. check space engine when you're done!