If IRRICAD can't find Irricad.mdb, it could be because the database has not been copied from the disc. Copy Irricad.mdb from the disc into the \Irricad\Database folder (commonly found in C:\Program Files\AEI Software\). Right click on Irricad.mdb and select Properties. Uncheck 'Read Only'. Click OK.
You can also receive this message if you have installed a very old version (pre 7.47 or 3.47) on to a Vista machine. Dao350.dll has not registered or has not been installed.
To register Dao350.dll:
You need to open a command prompt. In XP you can go to Start|Run and type in CMD. A DOS window will open up.
Now type in cd C:\ <enter>
cd program files <enter>
cd common files <enter>
cd microsoft shared <enter>
cd dao <enter>
regsvr32 dao350.dll <enter>
it should now tell you that Dao registered successfully.