If you did nandroid backup before installing the zip file then all you need to do is restore that backup.
Sent from my SGH-T989 using XDA App
Current: TMobile Samsung Galaxy S2 Hercules. ROM: CM9
Samsung Galaxy Nexus GSM ROM: Stock Jellybean (on loan)
LG G2x. ROM: Eaglesblood (Sold)
TMobile Samsung Galaxy S Vibrant. ROM: Bionic 1.3.1 (Sold)