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In that platform, a dword designates a 32-bit (4-byte) unit. Similarly qword (quadruple word) is a unit of data that is four times the size of a word. On the x86 platform, this unit of data is 64 bits long because the definition of word on an x86.
Dword and Qword has nothing to do with the bit version of Windows. To make things simple a Qword is four 16-bit words not one 64-bit word. This is why a Qword can exist on a x86 machine. Some computer architectures define the term dword (double word) to be a unit of data that is twice the size of a word. The x86 platform originally had a word size of 16 bits (2 bytes) and that usage of the term is confusingly retained even though the actual processor word size is now 32 bits or even 64 bits.