Have installed service pack 1 on the computer ( Windows 7 Service Pack 1 (SP1)- Installation Tips ). I recommend you to check for windows update and install all important and optional updates. Please remove any other security software installed along with McAfee ( FAQ ). You need to uninstall McAfee first, then run MCPR tool ( http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe) and restart the computer. Login to McAfee account and install McAfee again ( How to install McAfee ) .