Disk Investigator

Disk Investigator helps you to discover all that is hidden on your computer's hard disk and can also help you to recover lost data. Display the true drive contents by bypassing the operating system and directly reading the raw drive sectors. View and search raw directories, files, clusters, and system sectors, verify the effectiveness of file and disk wiping programs, and undelete files.

http://www.theabsolute.net/sware/dskinv.html

Delete Doctor

Delete files that are difficult to remove, such as those left by viruses and trojans, or files with corrupted names. This program can also delete files like "index.dat", which store Internet history, by scheduling them for deletion upon system restart. Select a file to delete from the built-in file browser or drag a file to the application's icon or window from Window's Explorer.

http://www.theabsolute.net/sware/#deletedr