Actually on my Vista Business system it is much easier than you indicate. In the Start Menu, rght click "Recent Items", click Open, click the [Recent] directory if necessary, select all the files in the directory, then Delete (to the Recycle Bin) or Shift Delete (for permanent deletion). This is useful to both clear items you don't want others to see, but also to update the list to make it useful to you in running the computer. Having worked out how to do it (thanks to the last poster

), I will now do it every few weeks via a desktop shortcut.
A similar approach can work in [Start] [Documents], if you want to clear that list as well. Right click Documents in the Start Menu, then Open. That will take you to your documents folder under your user name. Vista seems to accumulate a pretty useless collection here, so I would delete them all to the recyle bin (in case you want to get them back sometime). You can then let Vista do its own thing and accumulate another probably useless list of folders and files, or you can create your own list of files that you want to access frequently. In Explorer, right drag the file name into your Username Documents folder, and create shortcut here. Now when you go to Start Documents, you should have a useful list of files rather than a load of old rubbish. Will keep an eye on this and edit further if needed.