Right-click problem using MS Notepad

A strange this has happened when using right-click and Notepad on my PC. If I highlight text and right click there is a delay of several seconds and a faint dialogue box opens. Then this box becomes as normal, except instead of just the 6 menu items ending with "Select all", 3 additional items appear -

Right to left Read Order
Show Unicode Control Characters
Insert Unicode Control Characters.

Other right clicks seem OK its is just Notepad.

Any ideas what is causing this?

http://www.microsoft.com/resources/documentation/win...

Sorted! Many thanks.

I checked in Control Panel/Regional Settings and on the Language tab I had Supplementary language support box ticked. I un-ticked and rebooted, all OK.