I've found this: http://www.componentspot.com/doccenter/SharpZipLib/
I've looked at what it supports and other things, but would anyone be so helpful to get me on the right tracks of extracting a file, it's for my Updater once again, everything is in PERFECT working order now, I just need to get the files in a ZIP file, delete them from the current directory and extract the ZIP ( or override the current files ). I'm stumped as how to do this though, where would I start?