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What exactly happens when you open iPhoto ? Go to Home folder and open Pictures folder. Do you see your iPhoto Library there ?
Please don't post new questions. Instead please reply back here. Open Trash and do you see iPhoto there ?
If not, search iPhoto in Spotlight (searchbox at the top right corner of the screen) and what does it show ?
There are two files related to iPhoto. One is iPhoto application and the other one is iPhoto Library. iPhoto Library is the database that contain all your photos. So I need to know which one you deleted.
Open Trash and do you see iPhoto there ?