You can try an office repair, you will need the cd. Open word and click on Help and then detect and repair.
You may also be jammed up with malware, very common today sorry to say.
For the Spyware/Malware the two Free scanners are AdAware 6 at:
http://www.lavasoftusa.com/
And Spybot Search & Destroy at:
http://www.safer-networking.org/index.php?page=download
After Installing each check for updates before proceeding. Both have several cool tricks, Adaware has a custom search that can search your Hosts file and your archived files as well. SPpybot S&D has an new program called Teatime that doesn't install by default you have to check the box ehn you are installing. SPybot S&D also has an Immunization program.
Another excelent program is SpySweeper from www.webroot.com, it allows for one update and then you need to purchase to get anymore updates. It will find a lot that the two free one didn't.
I also use PestPatrol which also costs money. It is locate dat:
http://www.pestpatrol.com/ and they have a free pest scan if you can stay on the Internet long enough.
Steve Gibson also has several really good security tools at:
www.grc.com