> As I use the PC most of the time playing games are there any disadvantages
> using the 64bit-version?
>

Since you mostly do gaming stick with x86 for now. I already have a new
game that doesn't run on x64 because of a stupid mistake by the devs and I
have heard of some others. Be sure you get both dvd's so you can easily
change your mind in a year or so when games have appeared that leverage
64bit processors. That's when the 64bit fun will really begin.