THANK YOU this solved part of the problem. I was able to delete 2 large files
with this method. But two files still remained. The blinking cursor just kept
blinking forever, and never deleted. Also, explorer started using 100% CPU
again, and eventually stopped responding. I tried renaming the files, but
that caused the same problem. I'm going to try to rename them in the command
prompt instead of in windows contest menu & see if that works.

WOW, perseverance paid off. But I had to use different methods for wach file
I wanted to delete. For some reason no one method worked on all.
Here's what finally worked (thanks to you)
I used the DEL command as you suggested. (cmd.exe.  I had thought of trying
a command prompt, but had not yet figured out where to find it in Vista!)
This worked for two of the files.
I got rid of another file by the following method (suggested in another
group): When right clicking on the actual file, I held the shift key, and
chose delete. This brought up a dialog 'are you sure you want to permanly
delete' so I chose Yes, and it did it.
The last file, I used the REN command in the cmd.exe, and renamed the file
to just the name, with no extension. Then the DEL command, that worked!
Not sure why each file needed it's own method to work. Each file was
recorded & saved by the same program in the same manner.
At any rate, I now have the hard drive space back, so I feel ok to record
more.
THANKS!!