Spotify Malware causing MAC OS X auto reboot?

Good morning. I have upgraded my iMAC to OS X Leopard. It was working great until my daughter came home from college and downloaded spottily. Spotify seems to be causing a problem as it automatically launches and now causes a message 30 seconds after booting up. The message is "You need to restart your computer. Hod down the Power butting until it turns off, then press the Power button again" After rebooting, I pulled the details on the shut down stating that "Insecure Start-Up Items Folder Detected.

I read about Spotify Malware. My Mac will not stay on for more than 30 seconds each time before getting the shut down message that freezes the computer until shut down / reboot is performed. Have you seen this before? How can I get Spotify out of my Start Up folder / off of my MAC when my MAC only stays up for 30 seconds? Thank you.