Imo Clarkdale support ceased in Feb. 2011. You could still install the drivers though, although they tend to break during HD-TV.
The latest drivers are known to have issues when pulled from WU. In general NEVER use igfx drivers from WU.
IMO there are fixed ones from intel download, but am not sure if your board (and mine) should use them.
You wrote "You could still install the drivers...", but I can't.
Every attempt to install a newer driver as .2622 will stop with the above mentioned message.
There are newer drivers listet in INTEL download for my board. Why they are listed, when they can't be installed?