Thank you milone, cgwatcher isnt installed in one of those folders. Dunno what happend, but i downloaded the program again and now its working. Seems a config file was messed up.

Another problem i am having:
Sometimes windows detects only 3 of my 4 R9 280X. And sometimes, if 4 devices have been detected, one of them crashes after few hours of mining (its always the same card and in both cases i dont gain the expected hashrate). Then cgwatcher restarts cgminer and the crashed device runs with half hashrate (dunno why), so my total hashrate is about 2300kh/s. I set up treshhold to 2500 or below to force a restart of cgminer.

To solve the problem with this crashed device i have to restart the computer coz restarting cgminer doesnt solve this. How do i setup cgwatcher to restart the computer when hashrate drops below 2500kh/s? "Restart computer when sick or dead devices are detected" doesnt help.