Do a search on the computer for a file named: normal.dot . (Yes, that's "normal dot dot".) When the search finds any files named "normal.dot", then delete them all.. Restart the computer and reopen Word.. A new, clean "normal.dot" file will be created and will hopefully cure the issue.
If the above doesn't cure the problem, please tell us the version of Word/Office that you're using.. In addition, make sure to install the most recent Service Pack for your version of Office. That may helps as well.
Hope this helps.
I have a 4 yr old Dell dimension 3000 running windows XP. While working in Word, it kept shutting down my program whenever I copy and pasted anything. I figured I would just restart the computer to work out this kink but now it won't finish the boot. I have tried to restart it in safe mode also with no results. It stays black with my mouse arrow sitting in the middle of the screen.