Windows Backup skipped [insert file location here] because it is on corrupted drive c:/

I tried to run windows 7 backup this morning for the first time, backing up to my secondary hard drive. However, I received the message that some files were skipped and it seems to be everything of value!

Windows Backup skipped C:\Users\Lisa\Documents because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Public\Documents because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Music because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Public\Music because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Pictures because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Public\Pictures because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Videos because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Public\Videos because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\AppData\Roaming because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\AppData\Local because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\AppData\LocalLow because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Contacts because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Desktop because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Downloads because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Favorites because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Links because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Saved Games because is it on corrupted drive C:\.
Windows Backup skipped C:\Users\Lisa\Searches because is it on corrupted drive C:\.

What on earth is wrong? There doesn't appear to be any problems with my hard drive, and I can access any of the files currently in those libraries with no problems, as well as saving to those libraries with no problems.