After upgrading to Windows 8.1, ESET Service started behaving oddly, very high CPU usage.
I uninstalled completely (v6.x), and have now installed the latest v7.0.302.26.
But the CPU usage is still high, here is a line from the Task Manager:
ESET Service (32 bit) 31.2% 81.6 MB 0 MB/s -0.1 Mbps
On another note: The 64-bit version still uses a 32-bit version of the ESET Service, really?!
PS. And no, temporarily disabling protection does NOT reduce the CPU usage...