Well, killing all of my system processes didn't seem to fix the problem. Just out of curiosity, I tried compressing the offending file using Winrar...that worked and created a compressed copy in the same folder the file exists. I was able to delete the .rar file, but still couldn't do anything with the original. One thing I've noted is that whenever I try to run one of the various cleaners/deleters/unlockers on this file, the program ends up "Not responding". How would a file be able to have that affect on so many different types of programs?