I don't quite know why it has worked this time as I have tried this previously as suggested on this forum (may be using I'm using a different driver this time though?) but I now have my 4750 gpu working on Win 7 64!
I was inspired by 'dam89' at the following forum to retry using Mobility Moder to 'mod' a gpu driver (
ATI HD 3200 & HD 4570 in laptop not working - Windows 7 Forums)
I downloaded Mobility Moder (
http://www.radeon.ru/downloads/modto...otNETSetup.exe) and also the the
'Windows 7 64 Bit Edition - Radeon - Radeon HD 4550 driver' from the ATI site (
Graphics Drivers & Software).
I then unistalled all ATI software via control panel and to ensure all evidence of it was gone I ran drive sweeper (
Guru3D - Driver Sweeper) to delete any thing left.
After a restart I double clicked on the downloaded driver so it extracted to
C:\ATI\Support and cancelled it before it installed.
I then installed and ran Mobility Modder and using 'browse' located the driver folder within
C:\ATI\Support\.... I ensured
Disable UAC box was ticked and then clicked
Modify. This modifed the driver.
Once done I disabled the 3200 gpu via
Device Manager and then ran the setup file in the modified driver folder (
c:\ATI\Support\[Driver Folder Name]\Setup.exe).
Once this had installed I was prompted to reboot and once restarted I checked device manager and both the 3200 gpu and the 4570 gpu (it shows as
ATI MOBILITY RADEON 4530/4570) are running OK (
NO 'CODE 10' & NO '!') :)
As with Sebs solution you can then simply switch between gpu's by switching displays (one is on a virtual display and the other is the actual display under
screen resolution) or you can disable the 3200 gpu in device manager so the 4570 alone will be in use.
To prove it is working my windows experience index is now 4.1.
Thanks to all for your helpful discussion and information... I hope this fix works for you as well.