Sounds like you installed the OCLP app. This doesn't hurt anything - you have to do further installation steps before it does anything for you.
Assuming it was the OCLP installer, and you want it gone: Open the .pkg again, it will open up an Installer window. Do not click "Continue", instead go to the File menu, and choose "Show Files" (or click Command-I). In the Files window that opens, click the disclosure triangle on upper-left.
This gives you a full list of the installed files from that package. In the case of OCLP, it's the OCLP app installed in /Library/Application Support/Dortania/ along with a helper tool in /Library/PrivilegedHelperTools/ (Quit the Installer when you're done with the files list).
You can delete the listed files manually, along with the OCLP app alias installed in /Applications. That should get most of it. There are likely a few entries in assorted startup item folders, but those won't do anything when the apps themselves are gone.
