Any particular reason why you want to delete those empty folders? I have them exactly as you do on my XP system.
I thought they could be deleted using the following approach through a Command Prompt, but they cannot. I don't know what process is using them. It might be possible to boot up in safe mode and follow this procedure, or just delete them normally from there, but what's the point anyway?
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Open a Command Prompt and type the following line exactly and hit enter:
cd c:\Progra~1\Micros~1\Version3.0
>> you should now see:
C:\PROGRA~1\MICROS~1\VERSION3.0>
>> enter exactly rd /s bin
You will get a prompt, confirm by entering 'y' if the target is correct.
>> Next enter each line:
cd C:\PROGRA~1\XEROX
rd /s nwwia