Did you download the fix from the Singer website or a free one? A friend that works with sewing machines gave me a free website to download from rather than pay the $130.00 from Singer. That may be the problem and I may have no choice but to purchase it from Singer and I will if that is what I need to do. The one I downloaded read like it was exactly what I needed.
The one I used said that it was the 64 bit for the 250 and for Windows 7, Vista etc.