OK, to be short, this is not a commercial presentation of a software.
The problem was that I had to extend my primary Windows 7 partition, as the amount of free space decreased under 200 MB.
Of course, as Windows 7 Disk Management sucks, my first thought was Partition Magic 8, but after reading some forum posts I decided to use other stuff.
So, I found this AOMEI Disk Partition Assistant Home Edition, which, "wait for it..." - is free :D ... and I totally recommend.
You may google for it or find it here:
AOMEI Disk Partition Assistant