Recuva won't overwrite anything!

After I downloaded the latest versions of Recuva & CCleaner I've run into a problem with recuva not wanting to overwrite files. After I scan for files and highlight all of the ones I wish to overwrite & then click YES on the secure overwrite box the Operation Completed box brings up the Status message "Not overwritten-More data is available". I've tried going back to the older versions of Recuva that ysed to work right with no luck. Also CCleaner used to wipe my free space on drive C in about thirty minutes. The newest version is now telling me it will take more than 24 days to do the same operation! Any ideas of what's going on? I have a ThinkCentre M52 computer with 2gigs of RAM! I'm also using windows xp pro service pack 3. There's no mention on Piriform instructions for Recuva as to what "More data is available" means!