Another possible scenario that could occur in Quik Check for Windows (that has since been fixed in Adagio Checks) is the existance of orphaned batch files in your database. If data was restored incorrectly, some files related to open batches may exist in your data even though they shouldnt' be there.
First, open Quik Check and see which batch numbers exist. Then browse the data directory and look for files of a format QCC####?.DAT, where #### is a four-digit number related to the batch number, ? could be either D, H or I, and DAT represents your data extension. If you find files of this format with numbers other than existing batch numbers, that means you have extraneous files that need to be removed. When nobody is using the data, remove these extra files to a temporary directory, or simply delete them.