Had the same problem. Here's what I did.

First, as recommended I installed it (again) in a
different folder than before. Then I did the following:

Start / Settings / Control Panel / Administrative Tools /
Computer Management

In Computer Management, click on "Disk Management" in the
tree: Computer Management (Local) / Storage / Disk
Management

Highlight the hard drive letter. Then, from the menu in
Computer Management, click: Action / Rescan disks

Now Money works and I no longer get the missing disk
error message.

- quote -

Anyone have any ideas as to why I cannot get money 2000
to work at all on xp professional? I get the error
message, "Unable to initialize a required Money
component. Please reinstall Money from your original
product disks". Can I do something in the registry to
fix this?