You've encountered an error that pertains to a possible registry fault for an MSN file that is vital for downloading processes. Here are things to try:
1. Restart the computer .
2. Click Start in click Run , type regsvr32 c:\progra~1\msn\msncorefiles\msnmetal.dll and then click
OK . You will receive the following message:
DllRegister Server in c:\progra~1\msn\msncorefiles\msnmetal.dll successed.
3. Sign in to the MSN software again. Then try to download McAfee again.
If you are still experiencing the same problem, please do the following:
uninstall MSN Explorer: http://answers.msn.com/solution.aspx?solutionid=115dc6c5-4ae7-4e38-8e0b-3eac07d020fa
re-install MSN Explorer: http://answers.msn.com/solution.aspx?solutionid=03fe3670-ac35-4523-834a-b6835219beb0