Only if the processor has special 64-bit extensions, known as AMD64 or EM64T. Certain Pentium 4 processors, all Core 2 processors, and all AMD Athlon 64 processors have these extensions, and can thus run 64-bit operating systems and programs.
In the program files folder in your hard drive.. 32bit programs will go into a folder called Program Files(x86)
I think it has something to do with the architecture being x64 and not x86, not really positive though. Having the same problem on Windows 7 64bit, but it works fine on Windows 7 32bit.
64bit processors have most registers specially the integer registers as 64bit. It can handle 64bit wide internal and external data. All internal and external buses may or may not be 64bit wide. - Neeraj Sharma
cisc cpu
There is not. And that is because 64bit can run 32bit, but 32bit has problems running 64bit.
PC = Personal Computer. Mac OS = the Operating System used by Apple's Macintosh computers. X86 = A 32 bit processor. Originally the name came from Intel's 8086 processor which was a 16 bit processor but the name X86 is now used to denote a processor that can handle 32 bit and 16 bit instructions. X64 = A 64 bit processor sometimes known as an X86-64 as they can handle 16, 32 and 64 bit instructions.
64bit
Absolutely !
64bit
You can use either a 32bit or 64bit operating system (OS) for 4GB of RAM. 4GB of memory is the limit a 32bit OS can handle, this includes any memory that your graphics card has, so your computer may recognise only 3.5GB of RAM if you have a 512MB GPU. You will need a 64bit os that will use all of the ram.
The easiest way is to check Program Files folder. If you have two of them one is Program Files, another one is Program Files x86 then you have Windows x64, if you have only one Program Files, you have Windows x32.
Try an emulator, such as Dosbox. There are others, too.