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Yes, make sure that you uninstall McAfee, but most important is to use the MCPR tool after that.
If you do not use that tool you will have problems.
Download and run the McAfee Consumer Product Removal (MCPR) tool:
Download the MCPR tool from: http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe and save it to a folder on your computer.