You are in Ireland right? Did you by any chance install a Hungarian language pack or somehow alter you location/keyboard language in Control Panel's Regional Settings?
Make sure they are correct.
Uninstall McAfee in the normal manner through Control Panel
Run the MCPR removal tool and reboot.
Download from your account on the UK servers here: http://home.mcafee.com/Default.aspx?culture=EN-GB
This is very strange as the download normally defaults to the perceived system language.
Same thing happened to me. I was helping an elderly neighbor install McAfee. We got almost through the download (a new account) and the language changed to Dutch. There is a 'language choice' dropdown menu, and English is on it, but is grayed out and unaccessible.
The owner of the computer is 88. The computer belonged to her late husband. Neither would even know how to reset the language.
Oh, and when I tried hacking around, the language changed again, to Arabic.
What's going on? Shall I advise her against using McAfee?
Something weird is going on. I suggest you contact Technical Support via the link under Useful Links at the top of this page. It's free.