Mp3tag was not able to display the help file in your standard browser

Apologies if this is a repeated topic, but I can't find anything using the search tool on here. but I get the above message whenever I start mp3tag or if I use certain of the TAG Sources (Discogs for example) I'm running on Windows 7 (yeah I know!)
does anyone know how I resolve this?
edit ..
I use Chrome as my browser .. I think that may be the problem, if I set Internet explorer as default I no longer get the message!

see e.g. here:

or this one: