Find/Replace in Access table

[kate hather]

Whenever I carry out the first search in my Access table I
get the following error message: Invalid Argument. Once I
click on ok the data I am searching for is found, so it
does actually work. I just wondered why on each initial
search I get this message.

My criteria for searching would be something like:

Find what: Philip
Look in: Case History : table (this is the only table in
there)
Match: Any part of field.

I looked up this problem in the Access Helpfiles and it
suggested checking my data seperator was a full point (set
in control panel). I checked this and it is correct.

Hope someone can help.

Kate