Installation: On a machine running XP, the operation is long, very long and quite complex, with double data transfer from PC hard disk to removable hard disk drive (HDD provide a sufficient capacity) and in other direction after installing Win7. But ultimately, the result is convincing! In a tired machine heavily loaded, and which were comparable to the oar, the long solitary crossing of the ocean Maude Fontenoy, I got a PC running like new in Win7! The coup was necessary brushes!
On a machine running Vista ... the operation would be simpler ... alas, it was even more complicated than under XP! More than 38 hours to transfer backup data ... to get to the final, a facility that fails. I had the procedure repeated for success by installing the XP way, that intended to Vista failed twice! In use, little difference with Vista.
In summary, if you have XP: No problem, go to Win7.
if you're running Vista: look into it twice before you decide the game is not worth perhaps the candle now that Vista is well developed.
DRC.