Refrence error

Hi everyone,
I have got problem with REF error,
just this morning i opened the file I work with everyday. The sheet January was fine, but the February had some REF ERRORS in it. This happened without me doing anything... Look, I know what REF ERROR is, but I don't know what happened to that February sheet that just this morning it went wrong!
can u help? Could it be that my windows has got a problem?
SEE THE ATTACHED FILE

Hi,

It's a bit hard to tell as there's no way to check what the Formula is supposed to be before the error occurred.

The January sheets Formula is completely different to the February sheet.

Can you explain what the Formulas in the February sheet were?

Thanks

Without knowing what you were doing there, or what those formulas were referencing, its pretty much almost impossible to try and figure out what they should be And having te WB in another language and "back-to-front" doesnt help much either