A family of Microsoft word processing software products for creating web, email, and print documents.
Try opening Word in application safe mode and check if it opens fine. To do this,
Click on start>run> type winword /safe and click OK.
Note: There is a space between Winword and '/'
If Word works as expected, the issue might be due to add-in(s) installed.
Refer the link below to disable add-ins for Word 2007:
http://office.microsoft.com/en-us/help/enable-or-disable-add-ins-in-office-programs-HA010034127.aspx