Bad news for Charlie, Vanadia - looks like there is some sort of corruption to the operating system of the installation's servers. In other words, the quick solutions are not gonna work (the dice gods are mocking you).
A little deeper investigation reveals some really seriously nasty data safeguards in place; simply removing the data storage devices and attempting to access them from a functional computer will also not work... at least, not without some serious supercomputing power to override said safeguards. There is a darned good chance that doing so could trigger destruction of the data itself.
This is not surprising; if the data is that sensitive, you can't have some chucklehead popping out the equivalient of your hard drive and sticking it in his pocket so that he can steal data at his leisure... but the lack of surprise does not make your life easier.
So, in summation, this could be hours, or it could be a LOT of hours before the data is avaible.
One final note - the cameras here use data disks, not casettes. Think DVDs with better storage capability. Note that these may also be encrypted.
Please detail how you folks wish to proceed.