64 bit support Hardware is minimum and 64 bit server support hardware is maximum.
Only Windows 64-bit operating systems can run 64-bit applications
All 64 bit versions of the OS's.
x86-64 is 64 bit processing on 32-bit architecture,not to be confused with true 64 bit-processors like Itaniumhttp://en.wikipedia.org/wiki/X86-64
The Ubuntu/Kubuntu kernel is configured to support 8 processors / cores in 32-bit and 64 processors / cores in 64-bit.
To use 64-bit specific applications, you must purchase both a 64-bit processor and a 64-bit version of Windows. 64-bit applications will not run on 32-bit versions of Windows, even if a 64-bit capable processor is installed. You also cannot install a 64-bit version of Windows on a 32-bit only processor.
You need the hardware that can support both 64 bit computing as well as the software (most especially the operating system) that can run on a 64 bit platform.
Yes, and given the lack of 64 bit software support, probably better, and you can use unsigned drivers.
Yes. However, Mozilla does not officially support the 64-bit build on Windows yet. You can find some downloads for unofficial 64-bit builds for Windows in the Related Links section.
64 bit
Yes. The mobile versions of the Pentium Dual-Core, and Core2 Duo support 64-bit operating systems.
It is almost always better to install the 64-bit version of an operating system when the processor supports it. The only reasons to install the 32-bit version of Windows 7 would be if your Mac only has a 32-bit processor (only the 2006 Mac Minis and early 2006 iMacs had 32-bit processors), or if you need to run 16-bit Windows or DOS applications.