What is the size of your download. My x64 from Microsoft is 3,194,168 KB and earlier today I downloaded x86 on a friends pc which came in at approx 2.6+ gb (I think it was, but know for sure it was less than 3gb). The name you give is the one I have for x64. Check the following:
cntl-panel/Performance Info & Tools/Advanced tools/view advanced system details in system Information.
Find "Version" Mine shows 6.1.7100 Build 7100
Find "System Type" Mine shows x64-based PC
By the way Build 7000 is the "Beta 1" version not the RC
I downloaded from here: Windows 7 Release Candidate