I don't think I can help with your specific issue, because it's a bit too technical for me, but I do know that you can only install the trial version of F-Secure once, so that may be one of your problems.
McAfee would certainly be another problem, so if you intend to use F-Secure, you need to ensure that McAfee is completely removed. Here is a list of Uninstallation Tools, but I'm not sure how current they are, so you may want to do another search for that.
Further, if you choose to continue to use F-Secure, as you have already tried to install it unsuccessfully, I would recommend that you run the F-Secure Uninstallation Tool to remove all possible debris from a previous attempt, and start again.
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