I installed the latest version of Oracle 11g R1 from their download site. The only issue I have experienced after the installation was done is that "nmefwmi.exe" crashes. This process is linked to the OracleDBConsole service.
The only way I have gotten around this error is to stop the OracleDBConsole service. The database itself is still active and running as you can see here.
I checked the Oracle forums and it appears this error has no solution at the moment, other than the "don’t run it on Vista" suggestion.