weird characters in record

A

access user

One record in one table of my database has chinese looking characters (could
be Japanese / Korean, etc - I can't tell the difference). I am in the UK and
all records were previously in English. This record cannot be deleted,
altered etc, so I cannot correct it back to what it was (there are about 20
plus fields to the record).

Error message:

"The search key is not found in any record" (this happens when trying to
update the record to correct it)


Questions:

What circumstances could cause this?
What is the best strategy to correct this?
How can it be avoided in future?
 
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