I dot think the extractor would matter...but I highly recommend 7-Zip. It's the best one and it's 100% free. Look up the latest "beta" version of 7-Zip. Use that. There is no file it cannot extract. it can even unpack deb files. (tho that's off subject..sorry).
Before trying anything else..right click on redsn0w.exe. Click on "Properties"
Click the "Compatibility" tab.
Click on the box beside "Run this program in Compatibility Mode". Make sure "Windows XP (Service Pack 3)" is selected.
Then on the very bottom, under "Privilege Level" click the box "Run this program as admin". This way it's already set to run as admin...n won't have to do so every time you open it.
If that does not work:
Also...I recommend you use Mozilla Fire Fox. It's the best browser to download IPSW's & jailbreak tools.
I use to be a IE user but once i started using Fire Fox...I couldn't go back to anything else..tho I use Safari from time to time.
I would install Mozilla FireFox. If ya want...download the latest beta...they always seem a lil faster.
But any way...download and install Mozilla Fire Fox. Use that.
Also make sure you download the latest resdsn0w from here:
https://sites.google.com/a/iphone-dev.com/files/home/redsn0w_win_0.9.10b6.zip?attredirects=0&d=1
Do as I said...extract with 7-Zip....drag the redsn0w.exe to desktop and so on.
Post back...let me know how it goes. I have a couple more tricks up my sleeve.