Very, very odd BOAC. I have Virtualbox installed on two PCs here at work (Linux) , a PC at home (Win XP SP3) and on two laptops (1 WinXP Pro and 1 Win 7) as well. In ALL cases the program files reside in the Sun directory of the Apps directory.
I have never seen an Oracle folder as pertaining to Virtualbox. And, yes, I am using v3.2.4