Have answered my own problem.
When Money was syncronising with money on the web it caused the duplications.
I have now turned this feature off and removed all my data from the msn.
I then used my backed up copy of the money file which luckily was not to far
out of date.
All is well again.
Unlucky if you get this problem and don't have a backup of your data file!!!!

Since money downloaded and installed the latest update my "My Money" file has
been corrupted. Now when Money starts, entries in my accounts are duplicated
and/or in triplicate.
I had a back up saved of "My Money" which i reverted to, but when opened in
Money a conversion process was gone through and the same happened. I
uninstalled money, reinstalled it, got the latest updates again (no choice)
and the same thing happens. My current account is showing -£19k.
Any one else have this??