Annoyed about the lack of multisample anti-aliasing in Batman: Arkham Asylum with your Radeon graphics card? Be annoyed no more, for GenL of the NGOHQ forums has managed to create a patch that works flawlessly in giving the ability and apparently it's rock solid with no side effects.
After implementing this patch, the message shown above should be gone for good and all levels of MSAA will be available. It's been verified as working properly in XP, Vista and Vista, both 32 and 64-bit.
For instructions on how to install it, head over to the source, which is also where you'll find the download link.