Follow the given steps to resolve the problem:
1) Rename the Desktop5.dsk and Cache.dsk file
2) Open the notes.ini file in your c:\lotus\notes folder. Find the line that starts with “Location =” and delete the rest of the line after the equals sign. Re start Lotus notes after saving the changes done.
3) Rename the address book (names.nsf) and create a new one
The location is c:\lotus\notes\data folder
If it doesn’t help you then, you require some Lotus Notes recovery software that can fix the Lotus database corruption issues.