1) the problem you describe can have several reasons: OO crashed while your document was loaded; you had a power failure and your document was open in OO but not saved; you have a dual-boot with MS-Windows, edited the document in MS-Windows and did not save it, or did not close OO properly before booting into Linux, or you hybernated MS-Windows with your document opened in OO and then bootet into Linux, or edited the document with another OO-suite which may have created problems for OO, ...
-> delete your folder ~/.ooo3, then copy the document to a new empty folder, and try to open it.
-> try to find any (hidden) backup files and delete them
-> for curiosity, and to find the cause of the problem, you could try to create a new user account, copy your document there and try to open it.
2) there is a difference in getopenoffice between the options "Reinstall" and "Completely remove". I think you did a reinstall but I asked you to try a Complete Remove followed by a fresh install, which is different to a Reinstall.
3) try to open and then save the document in a different office suite and then test if you can open it with OO.