First, how and why are you using Camera Raw 7.0 with CS5?
ACR 7.x requires CS6 to run.
Even if that's a typo in your post and you are running CS6 instead of CS5, no one should be running ACR 7.0, but ACR 8.4 —or at the very least 7.4.
Once any given camera model is supported by a version of ACR, it will continue to be supported in all subsequent versions of ACR. Each update to ACR has unannounced, unheralded bug fixes and improvements. Running 7.0 at this point is sheer madness.
If you give complete and detailed information about your setup and the issue at hand, such as your platform (Mac or Win), exact versions of your OS, of Photoshop and of Bridge, machine specs, what troubleshooting steps you have taken so far, what error message(s) you receive, if having issues opening raw files also the exact camera make and model that generated them, etc., someone may be able to help you.
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
Thank you. As the FAQ says, I only expressed my panic. Yes, it´s a typo and I have cs6. And yes, youre right, i should be running acr 8.4 ... I´ll fix that.