First of all, thank you, its working now.-
Next thing is that i dont need to pay for the power consumption, for 12 hours a day. In case of that i can use it in this time, cause my PC is running 24h/day anyway with nearly constant 800 up to 1000 wats.

Hey, just get everytime invalid shares. I mine with the cuda miner and my nVidia GPU with this bat

cudaminer.exe --algo=scrypt:2048 -o stratum+tcp://litecoinpool.org:3333 -u yourworker.1 -p password.1 -i 0 -l T10x20 -C 1 -H 2

for sure 'yourworker.1' and 'password.1' with my password/username.

can someone help me?