I say start over from scratch, because IMHO Cydia sucks...installer is better. And from what I'm guessing you used iliberty+ 1.3, which doesn't give you a option to install installer only cydia... So use a older version of iliberty+, you can download it here. Just choose to download iliberty+ for windows.
http://theiphoneproject.org/index.php/downloads
Just choose all the options you need/want, Then "go for it"!
Now I haven't tried this yet..since I don't got a iphone yet...but yeah IMHO this should work. Also if it does work(which Im sure it will) drop me a pm. Would really like to know if this worked for you, so I can use this "way" aswell when I get my iphone. Hope this helps.
BTW I think this version of ilberty+ that I gave you a link to download is the version before 1.3..since it says 1.2..
*NOTE* Do not upgrade to the latest version of iliberty+ when you first open the program. Because when you open it you'll get a option to upgrade to 1.3..just don't do it. Or you will have to download ilberty+ over again..