thank you for your answers.
i have downloaded cgminer 3.7.0
i have extracted this archive, i have added a startmining.bat file with the following text
"cgminer --scrypt -o stratum+tcp://pool.testserverino.de:3333 -u logn.workrlogn -p password" with usernames and passwords, and now if I click on startmining.bat , a black window appears that i have simply started cgminer 3.7.0, and nothing happens next
I have tried both 3.7 and 3.7.2 for scrypt mining and both are buggy. I use 3.5 and have no problems. The screen you see is trying to connect to the pool, but my guess is that it is the version of cgminer that is having issues. Try 3.5 I'm mining on testseverino now with it. 3.5 has mined over 3.5m Doge for me.