Thank you Allan, unfortunately it's still the same outcome.
Before all of this, I had a 350 GB HDD and 100% working (and still is).
Now it's a new HDD, to be more specific: WDC10JPVX-22JC3T0 ATA
I can't believe that I did anything wrong by installation of windows 7 32 bit.
Is there maybe anything I have to do before or after installation?