What is it?
Microsoft Word - winword.exe
What does it do?
Microsoft Word is the most common professional level document reading and writing application on the market. Due to this you will find plenty of viruses floating around that will try to represent themselves as this file.
You'll want to keep an eye on this google search for any known viruses. The normal location of this file is C:Program FilesMicrosoft OfficeVERSIONwinword.exe