As I have seen in Oracle certification matrix Forms & Reports 11g 64bit is supported under Windows7 64bit. So I tried to install it and to work with it. Unfortunately there are serious bugs in it, please read for more information MOS Doc ID 1395965.1.
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After starting Reports Builder, trying to open "Data Model" or "Web Source" will crash the Report Builder
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Impossibility to create a Query based on a Pluggable Data Source (PDS) in reports builder
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Reports Builder spins on CPU (grabbing full power of one CPU) when "Copy/Paste" functionality is used in Layout Model
For 1./2. is a workaround to disable all Pluggable Data Source (PDS) in cauprefs.ora, if you don’t use that feature.
But for 3. is no workaround besides to use Forms & Reports 11g 32bit!