WB is xp32 and vista32/64
last i read WB6.2 worked okay on xp64, 6.3 not so good - though others have posted they have had no issues = the dev mentioned getting Impulse to use some 6.2 files after it detects you have xp64
whether it works for you should be a separate issue from trouble installing..
how are you installing? via standalone, sdc, impulse, ?