Go to Control Panel, then open Add or Remove Programs and check if you have MSXML 3 installed.
if it's not there please download and install it via the link below: simply download and install the file named msxml3.msi.
after installing it... run the McAfee removal tool, reboot and reinstall the software from your online account ... post back if it resolves your issue... hope this helps...
Great! 15 minutes and everything was instaled! Thanks a lot for this helpful reply!
Amazing, glad you are OK now ;-)