Since no1 answerd yet i started to try other stuff.
I changed my Graphiccard (with the one on my Parents PC)
so now i traded my ATI HD 5750 for a Nvidia GTX 260.
Everything was working fine but then, again Bsod with this codes:
0x0000007E and right after boot another1 with the code 0X00000024
So i made a backup of all important files and started a new Clean Installation of windows 7.
Right after the installation on the Starting Screen of Windows 7 i got a new BSOD with this code:
Im desesperate :S
Hoping for any support