Uninstall Money Plus, and install Money 2005 UK using the link in what is currently the second post in this forum. Things will be good.
Do keep copies of your recent *.mny and *.mbf files on different media, and perhaps offsite. Let this scare motivate you. Keep multiple vintages of your Money backup file. Some people keep overwriting their only backup file, get corrupted, and back
up the corrupted file over a good backup file.
If you have a *.mny file that is timestamped after your install of Money Plus, you will want to use a different file... possibly *.m14 or .m12 etc. Money Plus may have renamed your existing *.mny file to that name. Money opens those files.