Most likely you still have remnants of the old software that did not remove when you installed the new software. I would recommend uninstalling via Add/Remove programs and reboot the computer. McAfee has a removal tool MCPR that cleans up any remnants remaining and can be found under Useful Links at the top of this page. I recommend you run this and reboot again.. Please ensure your date and clock are correct and you are up to date with any windows critical updates. Log in to your account at Mcafee and download and install your software. If you still have problems then contact Customer Service and or Technical Support Chat both of which are free.