The look and feel of Office 2007 for Windows is different so you may want to familiarize yourself with the new interface and features. Here are a few links to some online training videos that will help you get started.
Microsoft Online Training: Word 2007 Courses, PowerPoint 2007 Courses, Excel 2007 Courses
Use Office 2003 menus to learn the Office 2007 user interface
GCFLearnFree.org Online Video Training (below)