I think the system restore may have corrupted some files McAfee uses to run properly. May I suggest you uninstall via Add/Remove programs and reboot the computer. Go to useful links at the top of this page and run the MCPR removal tool. MCPR will remove any traces of McAfee that fail to completely remove via Add/Remove and rebbot again. Login to your online McAfee account and download your software.
See this link on your other issue.Required Reading - Home User Assistance Malware Troubleshooting McAfee uses Artemis technology as it sees something in the download file you mentioned. They will need a sample of it to analyze and if they see it as no threat they will issue you a special Dat file so your computer will allow it to be used in the future.