Error opening data version file

Go to Start - Programs - Quikchek - Datafixer

Click # 1 - Delete lock files

You should now be able to login to QuikCheK

If you get an error that says cannot delete lck files, you will need to browse to your data folder and delete the lck files manually.

You're looking for two files paradox.lck and pdoxusrs.lck. Delete them both, then you can login.