Start by renaming your OpenOffice user profile.
As you are using Windows close OpenOffice and the Quickstarter. Open File
Explorer. Copy and paste %appdata%\OpenOffice\4 in the File Explorer (sometimes called Windows Explorer)
Address Bar and press Enter. Rename the "user" folder - "user.old" is a
good choice. Start OpenOffice.
This cures most spellcheck problems.
To prevent this happening again, be leisurely in your closing down (powering off or hibernating) of the computer after properly closing your OO file and OO.
Use the formal computer closedown procedure and wait for a few seconds (10 or thereabouts) before powering off to be certain all disk activity has ceased - damage to the spellchecker often occurs if the computer is powered down before the hardware/software write buffers have flushed. It is only a matter of a few seconds - these few extra seconds will be less than the time needed to correct the problem, or, more likely, to rebuild a damaged file which can also occur through such over-hasty shutdown.
Apache OpenOffice 4.1.3 on Xubuntu 16.04 (mostly 64 bit version) and infrequently on Win2K/XP
14 October 2016 was Pooh's 90th birthday