Oracle 11g: OER 7451 in Load Indicator

I installed Oracle 11g R1 on my laptop running Windows 7 Enterprise Edition (x64 bit).
As I was working on it, i felt like there was something wrong - it was too slow.
I shutdown the database, and shot the startup command, but got stuck on "Mounted".
Although I was able to get it started a minute later by stopping and starting the Services (services.msc).
I checked the alert log for any errors and found the following was filling up my alert log:

Thu Sep 08 21:00:41 2011
Errors in file e:\oracle11g\app\diag\rdbms\rizwan\rizwan\trace\rizwan_j008_8896.trc:
ORA-12012: error on auto execute of job 11689
ORA-01403: no data found
OER 7451 in Load Indicator : Error Code = OSD-04500: illegal option specified
O/S-Error: (OS 1) Incorrect function. !
Thu Sep 08 21:00:47 2011
OER 7451 in Load Indicator : Error Code = OSD-04500: illegal option specified
O/S-Error: (OS 1) Incorrect function. !
Thu Sep 08 21:01:07 2011
OER 7451 in Load Indicator : Error Code = OSD-04500: illegal option specified
O/S-Error: (OS 1) Incorrect function. !
Thu Sep 08 21:01:09 2011
ALTER TABLESPACE example READ WRITE
Completed: ALTER TABLESPACE example READ WRITE
OER 7451 in Load Indicator : Error Code = OSD-04500: illegal option specified
O/S-Error: (OS 1) Incorrect function. !
Thu Sep 08 21:01:17 2011
OER 7451 in Load Indicator : Error Code = OSD-04500: illegal option specified
O/S-Error: (OS 1) Incorrect function. !
OER 7451 in Load Indicator : Error Code = OSD-04500: illegal option specified
O/S-Error: (OS 1) Incorrect function. !

After checking a document on MOS, I found out what the mistake was. I was running a 32-bit Oracle Software on my 64-bit OS.

I fixed it by uninstalling the 32-bit software and installing the 64-bit software.