SQL 2008 R2 SP3 keeps failing

Hi,

We have a 2012 R2 server that had SQL 2008 R2 installed, but it was upgraded to SQL 2012 R2 and it has the SQL 2012 SP3 installed (64bit). WSUS is complaining that it needs SQL 2008 R2 SP3 (KB2979597) to be installed. Each time I try and install it, it fails with error code 84B30002.

Any help on resolving this would be appreciated.

Thanks

Jonny