File repair. :
I would try to repair your *.mny file. Start with
File->RepairMoneyFile->QuickFileRepair
Then do
File->RepairMoneyFile->StandardFileRepair level 2
Then again
File->RepairMoneyFile->QuickFileRepair
If you cannot open Money, you can run salv.exe.
That is typically at "C:\Program Files (x86)\Microsoft Money Plus\MNYCoreFiles\salv.exe" Salv.exe only works on *.mny files -- not *.mbf files.
If you have not tried reinstall, and the other stuff did not fix things, reinstall. Then put the repaired dll into place.