The info you've given us wont really tie down the problem as well. Try adding -show_err to the command line of the shortcut - it'll hopefully give you an error message when it crashes. If its crashing that quickly its proberably a file error on startup parsing.
There also isn't much problem with deleting RTW and RTR and reinstalling RTW to change it just take the contents of your save folder and back them up and you wont lose any saves - also you can remember what factions you unlocked and put them back into PLAYABLE in the descr_strat.txt in world/campaign/imperial folder.
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