Ok, Device Manager says that the GPU is recognized properly, and shows the correct up to date driver
in the Drivers
I did not try uninstalling Catalyst suite before the GPU upgrade, but have tried uninstalling and reinstalling since upgrading.
The graphics card is seated properly, I have removed it and dusted down the connection as well before reseating.
Both Desktop Window Manager and Themes startup type is set to auto in Services.msc.
I have run the Microsoft Aero utility and all I get is the same message saying my GPU does not support Aero.
If it helps, the Aero effects are displayed correctly on startup, but then the desktop goes blank for a second and restarts without the Aero effects. However, yesterday the Aero effects worked perfectly for around two hours whilst I used the PC. When I turned the PC on again several hours later, the Aero effects would not work.
Thanks for the help, I'm beginning to think that the GPU may be faulty