Peter, Vulcanised is about right, BOAC is funny (and probably close to some truth too).
First thing I would do is BACK-UP your data, make sure you know all your passwords etc and then find out what brand of motherboard you have on your machine. Next, as suggested, do a search on the interweb of "mother-board error codes"
Hopefully you will find a match to the ones you are hearing and it will help identify the fault (or impending fault)
I believe they are normally referred to as POST beeps or BIOS beeps.
Have a squint here to get an idea.
Post Beep Codes, AMI & Phoenix/Award BIOS error codes
BUT BACK UP THAT DATA just in case it is terminal
edited to add: when you open MS Money is there a sequence of keys you need to press (a password or login code)? Reason I ask is that a computer will sometimes beep if a key is held down, it could simply be a sticky key within the sequence that you normally don't use like Q or Z etc ----just a thought.