Sorry to hear that you're still having issues. Here's a checklist:
Make sure all Apple updates have been done: Apple Menu>Software Update
Remove the antivirus and anti-spyware software.
Go back to Disk Utility, select your hard drive again and try the disk repair buttons on the right-hand side.
If all that fails, it may be a logicboard failure. Under warranty, there is no charge for the repair. Out of warranty, it's around £500.
Applemacster