"No, you must to reinstall everything. Install Windows , install drivers for mobo from the CD. "
That is patently untrue. Depending on whether Windows is successfully able to configure itself for the new chipset will determine whether on first boot you get a blue screen, or a long list of driver installs going on. I was able to go from a P45 chipset to a Z68 chipset without a reinstall. Windows 7 was able to redetect everything and installed everything, including audio and net drivers, all by itself.