First of all, thank you very much knightdk for replying, i really appreciate that you donate your time for helping me!
I will try to answer your questions as precisely as i can.
I clicked on this reset button:
http://www.pic-upload.de/view-29672744/configurationresetbutton.jpg.html Its german and says "configuration reset".
You are right, i thought that this shoudn´t happen too. Thats why i didn´t worry about clicking on it.
It is possible that this happend because the synchronisation wasn´t finished at this time? I had about 17 weeks left after almost 30h of downloading and calculation the data. Maybe this is a bug?
After i clicked on the reset button there was a message saying that it needs to restart the programm to effectuate the settings. I confirmed that because i saw this message befor when i configurated the proxy. And to restart the program wasn´t a problem at any time before that.
After restarting the programm the status of synchronisation said 7 years and a few weeks left.
I immediately checked aut the dater of the wallet.dat and yes, it has the exact time as it was right this time. So i think the wallet.dat was overridden as a consequence of the configuration reset.
Also the key i had send the btc to wasn´t listed anymore. Instead there was a complete new key i had no use to it.
After i recovered from this shock a bit i googled after a solution for this crap. Soon i found a Webside that has a guidance shown for looking up the private key in the console with dumpprivkey public key21345.
With this private key i should be able to reinsert the key in my new wallet and everything is going to be alright, i thought.
Sadly the message that poped up then was like " i dont know about your f*** public key, gtfo and stfu ... code -4"!
Well, to approve that i didnt make any mistake i tryed the same with the current "new" public key and it worked just fine. Logicaly i thought, because why should the "network" give me the privkey of a publkey if the requested privkey doesn´t mach with the publkey that is listed in my actual wallet.
To complete all this, here is the debug.log file:
www.file-upload.net/download-11287865/debug.log.htmlInterestingly it ends at the time i made the reset. Why does it not go further? The program was absolutly in use after this time.
Okey, so i hope i could help you with helping me
By the way, there is of course a reward over 50€ in BTCs for you or any other person who has the key for this problem - if there is a solution at all...
Again, thank you very much and have a nice time with many brilliant ideas