Ok, that's not the right way to be doing it. Try these instructions instead:
AllDroid.org - View topic - How to Root your Droid
Basically (they're kind of goofy) --
1. Download both of the files -- one is the official 2.0.1 image from google, the other is the exploit
2. Do this: cat signed-voles-ESD56-from-ESD20.84263456.zip droid-superuser.zip > update.zip
This is combining the 2 files and creating a third called update.zip.
3. Copy it to the SD card and restart while holding x
4. Once you see the exclamation point icon, press volume up + camera button. Follow the instructions on screen from there.
Edit: Before you copy update.zip to the SD card, I
strongly suggest checking the md5 checksum. This will tell you that the file you have is
exactly what is known to work.
You can get an md5 app here:
Download MD5 2.6 - MD5 - Calculate & compare MD5 checksums - Softpedia
Then (I haven't used this one, just the first I found in google) you'll run it on your update.zip file and ensure the checksum it spits out matches (cf653352967253e99d967498ffd9ce69). If it doesn't, start over.