I have a problem with RATTV3, in that I get only one section in the human-readable report file, and there is no name for the driver. It doesn't even say "Unknown" it simply has empty parentheses where you'd expect to see the driver name.
I'm running Windows Vista Home Premium 32bit, SP2, on a Dell Studio 1737.
What do you think of trying tracelog instead?
http://www.microsoft.com/whdc/Driver/tips/DPC_ISR.mspx
EDIT: Leapt through the hoops to download the Windows Driver Kit, and found, well, a very similar situation, in that it threw up thousands of unknown events it couldn't then process in any meaningful fashion- at least the output looked nothing at all like the link above suggests. Grrr.