I use an application called Agendus from Iambic (on both my Palm Treo and my Parallels Windows XP instance). It allows me to integrate the calendar, task list, etc. Anyways, when I modify a record in the Windows application and save it, I get an dialogue that says "ParallelsToolsC.exe has generated errors and will be closed by Windows. You will need to restart this program. An error log is being created.". I am running Build 5584. This also happened on the last build that I had installed (I update pretty regularly, so it was probably 5582).