Assuming the bad files are not in a critical directory such as /etc /root ...

Try moving everything you can out of the directory to a safe spot, then go back to the directory with the bad files and try rm -rf ./*
If that does not work, mv the directory to a new location, here's an example

the bad file is in /baddir/

mkdir /dir2
mv baddir /dir2
cd dir2

then:
rm -rf ./*


There is an appropriate way to delete the file itself, but I do not remember what it is outside my original post.

-Seg

edit: if it was left there by vi it's probably locked. I have not used vi in a long long time, if i recall correctly when the same thing happened to me i had to reenter vi and get vi to open the file, close it then it was gone. it's that kind of crap that sent me to pico in the first place.