Clean up your FrontPageTempDir and *.web files
From Kathleen Anderson's Blog:
"Steve Easton, a FrontPage MVP, has created a new tool called FPCleaner that will delete the temporary files that may get left behind when you exit FrontPage. It will also delete the *.web files (the cached copies of your site that can occasionally get corrupted and cause problems). I've been using it for a while now and gotten into the habit of running it just before I start FrontPage - in fact, it has a button to launch FP when you're through cleaning up.“