go the the startup tab. Deselect anything that doesn't look like your antivirus program.
You'll then have to reboot the machine.
A message will pop up when it reboots telling you that you've altered your startup - just check "don't tell me again" and click OK
What this does is turns off that rodeo or processes that have inserted themselves into your boot scripts. This does NOT delete the programs. If you want to run something, you can start it yourself.
This will undoubtedly help you. Good luck.