system
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After using the removal tool for old antivirus programs, you can go into search --all files & folders & search for the old product, remove what may be left behind.
If you are confident go into start run or command prompt— Type regedit click ok HKEY CURRENT USER Click on + sign scroll down to software click on + sign look for the name that associates your old antivirus then right click delete. You can also check HKEY LOCAL MACHINE----Software