由win Xp升到win7 32-bit時，好多用開的程式都用到，但再買新機(notebook)時，新機是用64-bit，大都用得到，但撞到用不到，已是用它們的64-bit版 同自己另一部機(netbook)是用win 32-bit的，都用合一用win7 ...

For most would-be Windows 7 users, a 64-bit version of Windows 7 is the right move. But if you don’t have sufficient RAM (at least 4GB), or you rely on devices that don’t have supporting 64-bit ...