Zip 100: "no access" error msg

I want to get some files off an old zip disk, so I hooked up the ole' Zip 100 and downloaded the latest driver (for Win XP...I have pro). Restarted. My machine is reading the zip, sort of, because I can see those files in there, but when I try to open one I get an error message saying I have "no access" and to see "my administrator". Well, I AM my administrator! Help!

I'm on a custom build Pent.4 laptop, WinXP pro, oodles of memory n stuff, all the latest everything, etc.

Thanks so much,

Peel