Open Office doesn't have the same number of people trying to exploit it and it may help protect against the same thing happening again. Simply a suggestion.
MS posted an update not too long ago (April) that had quite a bit to do with Word. After you virus scan, I'd head on over to the Windows update page and install the latest upgrades if you haven't already. If that doesn't work, check out your options for reinstalling the program. Do you have your disks still? I'm sure others will speak up with more experience in this area (I have an entirely unconventional way of handling this shit, myself).