Eventually all antivirus will report and delete Ufasoft bitcoin-miner.exe, I hope it's removed or replaced by another CPU miner in the next version of guiminer, since nobody uses CPUs for mining any more.
I don't know if it's linked, but I haven't been able to get rid of this unwanted 50% CPU usage since the new version and since my antivirus BitDefender has removed this executable. Together with the GPU usage, it has been killing my machine right and left, with shutdowns caused by high temperature and even a couple of blue screens (never had any for the past 5 years.)

So I'm probably looking at mining using phoenix directly or some other GUI miner. I have stopped mining altogether because of the 50% CPU usage on one core thing. I do NOT want guiminer to use my CPU for mining.