Error installing update rollup 7 on the CRM server

I received the following error when I tried to install rollup 7 on the CRM servers:
Microsoft.Crm.UpdateWrapper.DBUpdateAction failed

Please check that if you are running a 64bit OS and CRM installation, the update rollup 7 must be installed also on the 64bit version.
If you are using the language packs you can install rollup 7 32bit for the languages packs and install the latest rollup 64bit on the servers.