Many thanks for your reply mrplow. I am already using Quicken with Windows 7 on my PC with no problem but the Windows licence is for a single machine. No, I've not yet bought Parallels and would be interested to know why you prefer VirtualBox.
The thought of moving on from the unsupported 2004 version is rather daunting since to date I've not seen an alternative which will comprehensibly manage nearly 20 years of personal financial data. Again, if you have any suggestions I'd be very pleased to hear.