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#10
As you can see by the checkmarks, your system passes the requirements. I guess x86 is here used to describe processor family more than bit architecture, any x86 capable processor (capable to run Win32 apps) can run WinDbg.
The 64 bit architecture is sometimes told by Microsoft and other major players as x86-64: x86-64 - Wikipedia
No worries, it can be run on 64 bit Windows, too.