I’m also running under Win 8 and i do not have the first 2 problems.
I only have last one.
Dont know about ATI, but Nvidia has been ready for win 8 for a long time already.
@OP could we have a bit more info about your PC? stuff like what GPU, CPU, Motherboard, driver versions.
I fixed the random crashes by downclocking my GPU… I also had this problem and fix when i was still in Windows 7, on any version of the drivers.