Sure Delete Fills Hard Drive With 300 Gigs

I've heard a lot of good things about Sure Delete, which is used to delete files from your computer permanently (I'm really paranoid about identity theft). When I used it, I just expected it to clear these deleted files from my system so they couldn't be brought back, but what actually happened was much different. I came back to my computer to find that my 400 gigabyte hard drive that was originally less than 90 gigabytes full now has 397 gigabytes used and runs at an astoundingly slow speed. The readme for the program claims that if such a case occurs to delete the sdel.tmp files in the directory cleared, which in my case was C:. Unfortunately, they don't exist there, or anywhere else. I've done over 15 full system scans, used the Windows XP Disk Cleanup tool 3 times, as well as 2 3rd-party disk cleaners, attempted a System Restore (Which didn't work), tried to email the makers of Sure Delete (Which returned an error every time), re-ran the program twice, and uninstalled the program, restarted my computer, and checked again. Nothing has done anything. If you wanna check out Sure Delete,