Aside from simply looking for new enhancements to the interface (such as the Security Center), you can determine whether Service Pack 2 (or any Service Pack, for that matter) is installed in one of two ways:

  1. From the Start menu, right-click My Computer and click Properties. The General tab of the System Properties dialog box (in the System section) allows you to know which version of Windows and which Service Pack is installed.
  2. From the Start menu, click Run. In the Run dialog box, type winver.exe and click OK. The About Windows dialog box shows you the exact version of Windows (including Service Pack), down to the build number.

Page 8 – Training Kit (Exam 70-270)