thank you for answering me

sounds like a task is still running, or you need to reboot?
A task is still running? I don't understand, however I've rebooted several times without positive effects. Last try was to install catalyst 13.6 beta2 (I was on 13.5 beta that worked flawlessy, before to try CGMINER 3.2.0)
Did you delete bin files? Reset the drivers to USB/COM? If nothing works, re-compile and remove all the fpga stuff.
At first try I've copied CGMINER 3.2.0 files inside my old 3.1.0 CGMINER folder to update files (yes, all files + folders). That was the first crash, then I prepared a separate folder for every CGMINER version to be sure that no old file was messing up something. All my tried after first crash are from clean, just extracted folders.
Reset drivers to USB/COM: what is that? I'm mining with just GPU, no FPGA nor ASIC.
Recompile removing FPGA stuff... Uhm... that's will be my last last last resource....

Do you believe something about FPGA/ASIC is involved? If so why even returning to older 3.1.0 that was working is still crashing my system?
For instance Bitminter java client is mining flawlessy.
Damn, what a strange problem...