in a 300+ pages document, whenever i open, try to type,just in the first word once pressing space bar, it shows not responding, and ask me to shut down the program

i have been working for months on this document
it contains figures, equations, bullets and numbers
it is more than 350 pages
first, the problem happened while displaying down the autosave
so i disables the autosave
the problem occured again
i tried saving in different name
the problem showed again
help plz, i am stuck, need to work again on the same document smoothly
temporarily, i created a new document to postpone my work,
now on the new document i am on page 3, no problems at all
does it have anything to do with the fact that it is 300+ pages
if so, what can i do
dividing the document is completely unsatisfactory

note: i am using windows 7 home basic, office 2007 SP3
 

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Last updated October 5, 2021 Views 2 Applies to: