I have a friend who has been experiencing some problems with her version of
Word. Apparently, it will let her open existing Word documents with no
trouble, but it will not let her edit those documents or type new documents.
She tells me that the documents aren't set to "Read Only", which was the
first thing I asked her to check.

It seems that the problem has occurred on two separate computers, and the
only thing shared between the two has been a memory stick. The problem
"resolved itself" on one computer, but the other has not.

She is using Windows XP and the latest version of Word.

From the available information, both she and I speculate that the problem
may be caused by a virus. Is this possible, and are there any known viruses
with these symptoms?

If not, is anyone familiar with this problem, and can offer a solution?

Many thanks in advance to anyone who can help with this.

-EG