You have purchased the same suite Internet security suite, which you had earlier , so rather than uninstalling and reinstalling if you still have the older version installed or If you have partial installation [ie any component of McAfee installed ] , please follow the instructions here that should help in merging the current subscriptions back to your PC and fix your issue .
If you have uninstalled McAfee altogether and attempting a new install , please follow the below steps;
Check for any other security software installed on the PC and uninstall the same from control panel / programs & features in Win 7
Then, run the MCPR tool from here http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe and restart the PC
Run McPreinstall tool from here : http://download.mcafee.com/products/licensed/cust_support_patches/McPreInstall.e xe
Logon to your McAfee account and redownlad the software