The data on your computer (like photos, documents, etc.) as well as applications may or may not still be there depending on how you re-installed OSX. If you selected either the "Upgrade" or the "Archive and Install" option, your data and applications should still be there. If you selected "Erase and Install," your disk was completely erased. See
http://support.apple.com/kb/HT1545 for more information.
-Jay