Show her the Acid3 tests. Also fun, try rendering AJAX properly with IE6.
Ask her if she knows what a registry entry is. Also ask if she knows what spyware/malware and cookies are.
Open the System Information dialog in an HP computer and a Compaq and ask her to compare the two. Then show her a Wikipedia entry on Windows.
Open WordPerfect and Microsoft Word 2009 or 2010 and ask her if they are the same.
Show her the Start→Shut Down→Restart (if in XP) or Start→Restart procedure.
Also, start the TaskManager, go to the Processes tab, select explorer.exe, then click End Process. Click Yes. Now show her the desktop. Then click File→New Task, type “explorer.exe”, then click ok. Show her the desktop again.
As for your question, Vista was Windows 6, built on NT kernel v6.0, Windows 7 is, well, Windows 7, built on NT kernel v6.1. The name was to distance the product from Vista’s failure. Earlier versions of Windows are not included in this count due to the fact that they were not true OSes, rather, they were DOS shells.
To an observer, what would an object moving through a distorted region of space look like? Would the object just cease to exist in one location and reappear in another, or would the object appear to warp to the pattern of the space through which it is moving? How would light behave so as to observe such an anomaly?