Could you please check if the programs or its traces are present in the following locations,
Control panel,C:/program files and common files . . .
It means that the initial installation dint go on completely,
Run the removal tool from http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe and restart the computer after the tool finishes .
Re-download the products from your account in http://us.mcafee.com . Kindly report back with the exact error if you have any issues ,