Word: Can't edit in Russian, Can in English

Office 2010 and word specifically have me stumped.

Word has stopped allowing editing in existing paragraphs, problem is only in Russian only, English is fine. I can usually write new paragraphs , but then not change them.

As far as i'm aware I have all correct things ticked to allow alternate language to type and can switch between English and Russian fine and it was working ok initially, allowing editing.

Computer has winrus software installed, documents were originally types on windows xp machine circa 2004 and are now on windows 7 machine from 2012.

Any advice welcome

thanks

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