speeding up macro

I have this macro written that activates when the sheet is activated but it is slow. As soon as the initial hiding of data it then asks for a password. My problem is that when I click to activate the sheet, for a split second I can the data before it is hidden. I would like for this data to be hidden before the sheet is activated and then appear after the password is put in. I have tried to put the hidedata code in the sheet2.deactive part but that didn't work. I have also tried to put the code into the deactivate part of sheet1 so that it will hide the data on sheet 2 when sheet 1 is deactivated. I guess, I want the data to be hidden while sheet 2 is not active. I have sheet 2 set up so that after it is activated it will ask for a password and display the data when the correct password is entered. But like I said, for that split second before it asks for a password I can see the data as it is being hidden.
I have also put application.screenupdating = false befor the excution of the hiding code but that caused it to not hide the data.

Any ideas?