This error may indicate data corruption or that the log file (.ldf) does not match the data file (.mdf). If this error occurred during replication,
re-create the publication. Otherwise, restore from backup if the problem results in a failure during startup.
Solution:
- Re-install SQL Server Express
- Install SQL Server Management Studio
- Attach back the database file (.mdf)
Please Refer : How to install Microsoft SQL Management Studio
AND
Please Refer : How to manual attach database into SQL Server with SQL Management studio