I want to download Oracle XE in Windows 8.1 Pro (x64, 64 bit)
Oracle Database Express Edition 11g Release 2 Downloads , but there you can see
Does not work in Windows x64
Also, in Oracle&reg; Database Express Edition you have the list of supported OSes, and I don't see your version....
Possible solution : virtual machine with a supported 32bit Windows OS (or Linux 64bit).