The Microsoft Knowledge Base article,
Error Message: Run-time Error! Winword.exe Abnormal Program Termination should provide the fix.
Deleting (or renaming, the result is the same) the "normal.dot" file fixes the problem more often than not. It's a hidden file so before running a search for it, open My Computer, go to Tools>Folder Options>View tab and make sure "Show hidden files and folders" is checked.