|I agree with btk1w1. Norton (and Mcafee) antivirus programs need their own uninstaller program to remove all of their components leftover from a simple uninstall. Those leftover files will definitely cause conflicts with any other av you try to install. |
Also, I'm not sure if I read that right, but were you trying to install both Microtrend and NOD32 antivirus programs together? If so, most likely, they will conflict as well. You only need one antivirus. However, if you want to be overly cautious, choose a good online antivirus scanning site, but remember to disable the one you have installed while doing it.