I understand the situation that you have faced with regards to McAfee software on your computer. It seems that you must first need to uninstall existing McAfee software from your computer as you installed new MTP product on top of the trial version of McAfee which was already present, so these to McAfee subscription's/ products will conflict when you try to activate new McAfee product . First remove all McAfee files from your computer by running MCPR.exe tool by downloading it through this webpage under "Useful links" at the top, after running removal tool install new McAfee product & then you should be able to activate the product.
>Also could you please tell me the version of win 7 ( 32 or 64 bit)...?
McAfee Technical Support
windows 7 64-bit home premium