Tried running Oracle 11g XE on Windows 7 – 64bit and got lots of OSD-04500 errors.
Found the following errors in the alert log:
OER 7451 in Load Indicator : Error Code = OSD-04500: illegal option specified O/S-Error: (OS 1) Incorrect function. !
The relevant Oracle Support document is OER 7451 in Load Indicator : Error Code = OSD-04500: illegal option specified [ID 1060806.1].
The short answer is that you can not run a 32-bit RDBMS on a 64-bit Windows OS. And there is no 64-bit version of Oracle 11g XE available.