I found a similar error in one of my clients' InSQL installations. The error message I received was:
"SqlDumpExceptionHandler: Process 11 generated fatal exception c0000091 EXCEPTION_FLT_OVERFLOW. SQL Server is terminating this process"
Where the process number changed every time the server was rebooted.
We found that in addition to the runtime database and some of the data blocks being corrupt, that the MDAC needed to be re-installed. Try re-installing MDAC 2.5 (The version recommended with this version of InSQL) and see if that helps.