Bit confusing, as you refer twice to the tab name being in E78 but use E7 in the formula. Also, you don't really say what your problem is - I presume the formula isn't working for you.
In addition to the sheet name, you also need to include the filename (even if the file is open), and this needs to look like [filename.xlsx], which you could put into another cell or put explicitly in the formula. Also, it is a good idea to include apostrophes around the filename and sheet name, in case either of them include spaces. So, assuming you put the filename (only, without the extension or square brackets) in X1, then your formula would become:
Personally, I don't like ISBLANK - what's wrong with IF(D7="","", ...
Hope this helps.
Pete
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