hello I have an applicetion run very good on XP , but in win 7 64 bit it was runing ok until i install SP1 , the appliction read huge file from MAP driver on server . any Idea?

Is that an inhouse application or any other application. Can you please give some more information on that Application.

Maybe the application is not compatible with Windows 7 SP1. Have you done anything to make it work when you installed it in Windows 7 originally? You may temporary disable antivirus and firewall, then check if the issue still occurs.Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.