I'm not sure whether any version of Oracle -and you don't mention which 4 digit version you are using - is certified against Windows 2012.
So whatever hack you apply, for sure My Oracle Support will not be able to deal with any issues which may arise from this.
I'm sure you are aware Microsoft has a very bad track record on downwards compatibility, so I recommend downgrading this system to a certified version of Windows.
Senior Oracle DBA
Its Oracle 11gR2 - 11.2.0 and its installed on Win2008 R2. Only DPM itself is installed on Win2012.